Release blocker of v0.5

[waynexia]

What type of enhancement is this?

Other

What does the enhancement do?

This issue tracks the release progress of v0.5.

PRs need to merge:

• feat: support querying metric engine from frontend #2987 @waynexia
• feat(remote_wal): impl kafka log store #2971 @niebayes
• test(remote_wal): add unit tests for kafka remote wal #2993 @niebayes
• feat: support set timezone in db #2992 @Taylor-lagrange
• chore: bump version to 0.5.0 #3000 @waynexia
• feat(remote_wal): introduce kafka remote wal #3001 @niebayes
• refactor: hide RegionRoute behind TableRouteValue #2989 @MichaelScofield
• fix: revert unfinished route table change #3008 @waynexia

Implementation challenges

No response