feat: database user and permission manager

[tanmoysrt]

Fixes #2237

• Multiple db users
• Read-write mode support
• Granular mode support
  • Supports table privilege per user https://dev.mysql.com/doc/refman/8.4/en/grant.html#grant-table-privileges
  • Supports column privilege https://dev.mysql.com/doc/refman/8.4/en/grant.html#grant-column-privileges
• Complete Workflow
• Prettified error message from stacktrace
• Frontend
• Patch to migrate old database access users of sites to this new feature

Agent PR - frappe/agent#142

Preview -

db-perm-demo-1.mp4

Granular Permission test -

db-perm-demo-2.mp4

[codecov]

Codecov Report

Attention: Patch coverage is 22.43902% with 159 lines in your changes missing coverage. Please review.

Project coverage is 39.66%. Comparing base (21a3f76) to head (c977ed7).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
...s/doctype/site_database_user/site_database_user.py	21.71%	137 Missing ⚠️
press/agent.py	33.33%	10 Missing ⚠️
press/press/doctype/agent_job/agent_job.py	22.22%	7 Missing ⚠️
...table_permission/site_database_table_permission.py	0.00%	4 Missing ⚠️
...press/doctype/agent_job/agent_job_notifications.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2245      +/-   ##
==========================================
- Coverage   39.79%   39.66%   -0.13%     
==========================================
  Files         373      375       +2     
  Lines       28386    28586     +200     
==========================================
+ Hits        11296    11340      +44     
- Misses      17090    17246     +156     

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[tanmoysrt]

Failed tests are not related to this

• test_creation_of_db_server_adds_default_mariadb_variables
• test_site_update_callback_reallocates_workers_after_disable_maintenance_mode_job