resource_control: support unquoted default group name

[glorv]

What problem does this PR solve?

Issue Number: ref #43180

Problem Summary:

What is changed and how it works?

Make parser support default(without quota, compare to default) as resource group name. The use experience should be a litter better because many user don't notice that default is a reserved keywork and need quoted when used as a identifier.

Before:

mysql> set resource group default;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your TiDB version for the right syntax to use line 1 column 26 near "default"

mysql> set resource group `default`;
Query OK, 0 rows affected (0.01 sec)

After:

mysql> set resource group default;
Query OK, 0 rows affected (0.01 sec)

mysql> set resource group `default`;
Query OK, 0 rows affected (0.01 sec)

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

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[glorv]

/test all

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[glorv]

/ok-to-test

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/test all

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[hawkingrei]

/test tiprow_fast_test

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[3pointer]

/approve

[hawkingrei]

/retest

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, CabinfeverB, nolouch

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-29 04:01:45.664941811 +0000 UTC m=+853071.066192259: ☑️ agreed by nolouch.
• 2023-06-29 05:38:01.326811824 +0000 UTC m=+858846.728062272: ☑️ agreed by 3pointer.