Create table procedure returns the incorrect table id

[WenyXu]

What type of bug is this?

Incorrect result

What subsystems are affected?

MetaSrv

Minimal reproduce step

If two creating table procedures with the same table name and the If not exists option were executed concurrently, the procedure performed later will return an incorrect table id.

What did you expect to see?

The procedure executed later returns the table id of an existing table.

What did you see instead?

The procedure executed later returns the table id of a non-existing table.

What operating system did you use?

not matter

What version of GreptimeDB did you use?

0.6.0

Relevant log output and stack trace

No response