docs: bring v4.2.0 changelog to main (#1909)

bring v4.2.0 changelog to main

.changelog/v4.2.0/features/provider/1830-introduce-power-shaping.md

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+- Introduce power-shaping features for consumer chains. The features: (i) allow us to cap the total number of validators that can validate the consumer chain, (ii) set a cap on the maximum voting power (percentage-wise) a validator can have on a consumer chain, and (iii) introduce allowlist and denylists to restrict which validators are allowed or not to validate a consumer chain.
+  ([\#1830](https://github.com/cosmos/interchain-security/pull/1830))

.changelog/v4.2.0/state-breaking/provider/1830-introduce-power-shaping.md

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+- Introduce power-shaping features for consumer chains. The features: (i) allow us to cap the total number of validators that can validate the consumer chain, (ii) set a cap on the maximum voting power (percentage-wise) a validator can have on a consumer chain, and (iii) introduce allowlist and denylists to restrict which validators are allowed or not to validate a consumer chain.
+  ([\#1830](https://github.com/cosmos/interchain-security/pull/1830))

.changelog/v4.2.0/summary.md

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+May 17, 2024

CHANGELOG.md

@@ -1,5 +1,53 @@
 # CHANGELOG
 
+## v4.2.0
+
+May 17, 2024
+
+### API BREAKING
+
+- [Provider](x/ccv/provider)
+  - Assigning a key that is already assigned by the same validator will now be a no-op instead of throwing an error.
+    ([\#1732](https://github.com/cosmos/interchain-security/pull/1732))
+  - Changes the `list-consumer-chains` query to include a `min_power_in_top_N` field, as well as fields for all power shaping parameters of the consumer.
+    ([\#1863](https://github.com/cosmos/interchain-security/pull/1863))
+
+### DEPENDENCIES
+
+- Bump [CometBFT](https://github.com/cometbft/cometbft) to
+  [v0.37.6](https://github.com/cometbft/cometbft/releases/tag/v0.37.6).
+  ([\#1876](https://github.com/cosmos/interchain-security/pull/1876))
+- Bump [cosmos-sdk](https://github.com/cosmos/cosmos-sdk) to
+  [v0.47.11](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.47.11).
+  ([\#1876](https://github.com/cosmos/interchain-security/pull/1876))
+
+### FEATURES
+
+- [Provider](x/ccv/provider)
+  - Enable Opt In and Top N chains through gov proposals.
+    ([\#1587](https://github.com/cosmos/interchain-security/pull/1587))
+  - Adding the Partial Set Security (PSS) feature cf. [ADR 015](https://cosmos.github.io/interchain-security/adrs/adr-015-partial-set-security).
+    PSS enables consumer chains to join ICS as _Top N_ or _Opt In_ chains and enables validators to opt to validate the consumer chains they want.
+    ([\#1809](https://github.com/cosmos/interchain-security/pull/1809))
+  - Introduce power-shaping features for consumer chains. The features: (i) allow us to cap the total number of validators that can validate the consumer chain, (ii) set a cap on the maximum voting power (percentage-wise) a validator can have on a consumer chain, and (iii) introduce allowlist and denylists to restrict which validators are allowed or not to validate a consumer chain.
+    ([\#1830](https://github.com/cosmos/interchain-security/pull/1830))
+  - Changes the `list-consumer-chains` query to include a `min_power_in_top_N` field, as well as fields for all power shaping parameters of the consumer.
+    ([\#1863](https://github.com/cosmos/interchain-security/pull/1863))
+  - Introduces the `consumer-validators` query to retrieve the latest set consumer-validator set for a consumer chain.
+    ([\#1863](https://github.com/cosmos/interchain-security/pull/1867))
+
+### STATE BREAKING
+
+- [Provider](x/ccv/provider)
+  - Enable Opt In and Top N chains through gov proposals.
+    ([\#1587](https://github.com/cosmos/interchain-security/pull/1587))
+  - Assigning a key that is already assigned by the same validator will now be a no-op instead of throwing an error.
+    ([\#1732](https://github.com/cosmos/interchain-security/pull/1732))
+  - Adding the Partial Set Security feature cf. [ADR 015](https://cosmos.github.io/interchain-security/adrs/adr-015-partial-set-security).
+    ([\#1809](https://github.com/cosmos/interchain-security/pull/1809))
+  - Introduce power-shaping features for consumer chains. The features: (i) allow us to cap the total number of validators that can validate the consumer chain, (ii) set a cap on the maximum voting power (percentage-wise) a validator can have on a consumer chain, and (iii) introduce allowlist and denylists to restrict which validators are allowed or not to validate a consumer chain.
+    ([\#1830](https://github.com/cosmos/interchain-security/pull/1830))
+
 ## v4.1.1
 
 *April 22, 2024*