feat(base): Introduce a DisplayName struct

This patch introduces a struct that normalizes and sanitizes display
names. Display names can be a source of abuse and can contain characters
which might make it hard to distinguish one display name from the other.

This struct attempts to make it easier to protect against such abuse.

Changelog: Introduce a DisplayName struct which normalizes and sanitizes
display names.

Co-authored-by: Denis Kasak <[email protected]>

crates/matrix-sdk-base/Cargo.toml

@@ -50,6 +50,7 @@ assert_matches = { workspace = true, optional = true }
 assert_matches2 = { workspace = true, optional = true }
 async-trait = { workspace = true }
 bitflags = { version = "2.4.0", features = ["serde"] }
+decancer = "3.2.4"
 eyeball = { workspace = true }
 eyeball-im = { workspace = true }
 futures-util = { workspace = true }
@@ -60,14 +61,15 @@ matrix-sdk-crypto = { workspace = true, optional = true }
 matrix-sdk-store-encryption = { workspace = true }
 matrix-sdk-test = { workspace = true, optional = true }
 once_cell = { workspace = true }
+regex = "1.11.0"
 ruma = { workspace = true, features = ["canonical-json", "unstable-msc3381", "unstable-msc2867", "rand"] }
+unicode-normalization = "0.1.24"
 serde = { workspace = true, features = ["rc"] }
 serde_json = { workspace = true }
 tokio = { workspace = true }
 thiserror = { workspace = true }
 tracing = { workspace = true }
 uniffi = { workspace = true, optional = true }
-regex = "1.11.1"
 
 [dev-dependencies]
 assert_matches = { workspace = true }
@@ -77,6 +79,7 @@ futures-executor = { workspace = true }
 http = { workspace = true }
 matrix-sdk-test = { workspace = true }
 stream_assert = { workspace = true }
+similar-asserts = { workspace = true }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
 tokio = { workspace = true, features = ["rt-multi-thread", "macros"] }