Gravity v4

[cbrit]

• No-op consensus bump to v4 to bring the module version in line with the release
• Bump Cosmos SDK to v0.46.14, IBC go to 6.2.0
• Fix API breaking changes from SDK dep upgrade
• Bump go version to 1.19
• Remove old testnet dir
• Fix AfterValidatorBeginUnbonding hook and update unit test to cover the signer set creation logic related to unbonding

[codecov-commenter]

Codecov Report

Merging #542 (b7a4387) into main (143c0cb) will decrease coverage by 0.16%.
The diff coverage is 33.92%.

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@@            Coverage Diff             @@
##             main     #542      +/-   ##
==========================================
- Coverage   29.93%   29.77%   -0.16%     
==========================================
  Files          49       48       -1     
  Lines        7005     7022      +17     
==========================================
- Hits         2097     2091       -6     
- Misses       4726     4750      +24     
+ Partials      182      181       -1     

Files Changed	Coverage Δ
module/app/app.go	0.57% <0.00%> (-0.02%)	⬇️
module/app/encoding.go	0.00% <ø> (ø)
module/app/export.go	0.00% <ø> (ø)
module/app/state.go	0.00% <0.00%> (ø)
module/app/upgrades/v2/upgrades.go	41.86% <ø> (ø)
module/cmd/gravity/cmd/gentx.go	0.00% <0.00%> (ø)
module/cmd/gravity/cmd/root.go	9.58% <0.00%> (-0.12%)	⬇️
module/cmd/gravity/cmd/testnet.go	0.00% <0.00%> (ø)
module/x/gravity/abci.go	90.41% <ø> (ø)
module/x/gravity/client/cli/query.go	0.00% <ø> (ø)
... and 22 more

... and 1 file with indirect coverage changes