feat: introduce alter materialized view set resource group

[shanicky]

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What's changed and what's your intention?

Waiting for #19719, #19884

This PR adds support for altering resource groups (only for materialized views).

Since altering resource groups is also a form of rescheduling, I have unified the logic with the previous alter parallelism and changed most of the existing alter logic for parallelism to reschedule streaming jobs, making it more consistent.

This PR still needs some testing, including simulations with madsim.
Currently, the manual invocation of the alter command is working fine.

dev=> create table t(v int);
CREATE_TABLE
dev=> create materialized view m1 as select count(*) from t;
CREATE_MATERIALIZED_VIEW
dev=> create materialized view m2 as select * from m1;
CREATE_MATERIALIZED_VIEW
dev=> alter materialized view m1 set resource_group to test;
ERROR:  Failed to run the query

Caused by these errors (recent errors listed first):
  1: gRPC request to meta service failed: Internal error
  2: Cannot resize streaming_job 7 to empty worker set

# add new worker with `test` resource group

dev=> alter materialized view m1 set resource_group to test;
ALTER_MATERIALIZED_VIEW
dev=> alter materialized view m2 set resource_group to test;
ALTER_MATERIALIZED_VIEW
dev=> alter materialized view m1 reset resource_group;
ALTER_MATERIALIZED_VIEW
dev=> alter materialized view m2 reset resource_group;
ALTER_MATERIALIZED_VIEW

Checklist

• I have written necessary rustdoc comments.