resource_control: bypass some internal urgent request

[nolouch]

Background

In tidb, the source request will be tiny but urgent. we can consider skip it by resource control

const (
	// InternalTxnOthers is the type of requests that consume low resources.
	// This reduces the size of metrics.
	InternalTxnOthers = util.InternalTxnOthers
	// InternalTxnBootstrap is the type of TiDB bootstrap txns.
	InternalTxnBootstrap = InternalTxnOthers
	// InternalTxnMeta is the type of the miscellaneous meta usage.
	InternalTxnMeta = util.InternalTxnMeta ==> util.InternalTxnOthers
	// InternalTxnCacheTable is the type of cache table usage.
	InternalTxnCacheTable = InternalTxnOthers
	// InternalTxnBindInfo is the type of bind info txn.
	InternalTxnBindInfo = InternalTxnOthers
	// InternalTxnSysVar is the type of sys var txn.
	InternalTxnSysVar = InternalTxnOthers
	// InternalTxnTelemetry is the type of telemetry.
	InternalTxnTelemetry = InternalTxnOthers
	// InternalTxnPrivilege is the type of privilege txn.
	InternalTxnPrivilege = InternalTxnOthers
)

As the upper show, bootstrap, cached table, bindinfo, sysvar, telemetry, privilege, meta relative internal SQL can be skipped first.
Search code with kv.WithInternalSourceType(context.Background(), kv.InternalTxnBindInfo) can see the origin of the SQL.

Manual Test:

It's based on cse repo. I set the group with low RU:

  {
    "name": "1",
    "mode": 1,
    "r_u_settings": {
      "r_u": {
        "settings": {
          "fill_rate": 0
          "burst_limit": 1
        },
        "state": {
          "last_update": "2023-07-14T01:23:21.99892+08:00",
          "initialized": true
        }
      }
    },
    "priority": 0
  }

Before:

After

[zeminzhou]

Can this pr fix Error 8027 (HY000): Information schema is out of date: schema failed to update in 1 lease, please make sure TiDB can connect to TiKV.?

[nolouch]

I think Information schema is out of date should pass the DDL.

[zeminzhou]

If we do it, all DDL will be bypass？

[nolouch]

@zeminzhou I checked it, it's relative to the reload of the schema from tikv, and it will label as util. InternalTxnMeta, it's belongs to InternalTxnOthers, so I think This PR will fix the reported error.

[ystaticy]

How about bypass ddl request in this PR ?

[zeminzhou]

That's great, thanks!

[nolouch]

commit 7b5da57
is cherry-pick from #868 to make tidb-compatibility pass.

[zeminzhou]

LGTM~