feat(client/keys): check multisig key duplicate

[levisyin]

Description

This pr added a support for checking <appd> keys multisig keys duplicate.

• <appd> keys add
• <appd> keys show

And btw, add simapp/simd/simd to .gitignore

[coderabbitai]

Walkthrough

The recent updates include enhancements to the client/keys module to prevent duplicate keys in multisig configurations, improvements to genesis validation in the x/gov module, and a shift from panicking to error handling in the x/bank, x/distribution, and x/slashing modules. These changes aim to improve the robustness and reliability of the codebase by ensuring better error management and validation processes.

Changes

File(s)	Summary
.gitignore	Added entry to ignore the "simapp/simd/simd" directory.
client/keys/add.go, client/keys/show.go	Modified logic to use a keyFilter map for checking duplicate keys and updated variable naming.
client/keys/add_test.go	Added Test_runAddCmdMultisig function to test multisig key addition and error handling for duplicates.
CHANGELOG.md	Documented enhancements to client/keys module, genesis validation in x/gov, and error handling improvements in x/bank, x/distribution, and x/slashing.

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[julienrbrt]

For keys add it makes sense for keys show not so sure. If people rely on this weird behavior, then 0.51 won't work for them anymore.

[levisyin]

For keys add it makes sense for keys show not so sure. If people rely on this weird behavior they 0.51 won't work for them anymore.

What about showing warning message instead of return error(break the process)?

[julienrbrt]

For keys add it makes sense for keys show not so sure. If people rely on this weird behavior they 0.51 won't work for them anymore.

What about showing warning message instead of return error(break the process)?

Yes, I think it's better for show to do it that way!

[odeke-em]

Nice work, and thank you @levisyin! Mostly LGTM, but just some suggestions like tightening up the tests.

[odeke-em]

LGTM, thank you @levisyin!

[atheeshp]

lgtm

[julienrbrt]

utACK!