[s5dsn-eqee]

Refactoring: Move DCL parsing into src/parser/dcl.rs

Pure move of the GRANT/DENY/REVOKE, CREATE USER, CREATE ROLE, SET ROLE,
USE, CREATE POLICY and DROP POLICY parsers out of src/parser/mod.rs.
Three functions called from mod.rs become pub(super). Part of #2591,
layout per #2650.

[LucaCappelletti94]

@s5dsn-eqee FYI if you were wondering at the CI issues, basically the whole Apache org is currently sortof maxed out and all CIs are stuck. Infra has already on the case, but it may not be an immediate fix.

[github-actions]

No dialect label was applied because the title does not name a SQL dialect.

If this change targets one or more dialects, edit the title to <Dialect>[, <Dialect>]: <description>, add a Dialects: <Dialect>[, <Dialect>] line to the description, or reply with one. Reply Dialects: none if the change is dialect-agnostic.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.55828% with 134 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.83%. Comparing base (6a8b8bb) to head (8789743).

Files with missing lines	Patch %	Lines
src/parser/dcl.rs	83.55%	55 Missing and 79 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2710   +/-   ##
=======================================
  Coverage   81.83%   81.83%           
=======================================
  Files          42       43    +1     
  Lines       34651    34654    +3     
  Branches    34651    34654    +3     
=======================================
+ Hits        28357    28360    +3     
  Misses       2753     2753           
  Partials     3541     3541           

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