feat(crypto/keyring): add Linux's keyctl support (backport #21653)

[mergify]

Description

Supersedes #17607

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• updated the relevant documentation or specification, including comments for documenting Go code

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Summary by CodeRabbit

• New Features

  • Introduced a bulk-add-genesis-account command in the CLI for easier management of multiple genesis accounts.
  • Added a Linux-specific keyring backend for enhanced key management capabilities.

• Improvements

  • Enhanced documentation for the keyring package, detailing the new Linux keyctl backend.
  • Updated the CHANGELOG to reflect the latest features and improvements.

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This is an automatic backport of pull request #21653 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of c0eced8 has failed:

On branch mergify/bp/release/v0.50.x/pr-21653
Your branch is up to date with 'origin/release/v0.50.x'.

You are currently cherry-picking commit c0eced8d7.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   crypto/keyring/doc.go
	modified:   crypto/keyring/keyring.go
	new file:   crypto/keyring/keyring_linux.go
	new file:   crypto/keyring/keyring_linux_test.go
	new file:   crypto/keyring/keyring_other.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[julienrbrt]

Todo fix changelog

[julienrbrt]

Should be under unreleased features