Spark3: Support for SORT BY Clause

[R7L208]

Brief summary of the change made

Create SortByClauseSegment to allow for parsing of SORT BY clause. OrderByClauseSegment in Ansi was used with minor changes

Are there any other side effects of this change that we should be aware of?

Found #2650 while working on this. I excluded the rule for linting while testing.

Pull Request checklist

• Please confirm you have completed any of the necessary steps below.

• Included test cases to demonstrate any code changes, which may be one or more of the following:

  • .yml rule test cases in test/fixtures/rules/std_rule_cases.
  • .sql/.yml parser test cases in test/fixtures/dialects (note YML files can be auto generated with tox -e generate-fixture-yml).
  • Full autofix test cases in test/fixtures/linter/autofix.
  • Other.

• Added appropriate documentation for the change.

• Created GitHub issues for any relevant followup/future enhancements if appropriate.

[codecov]

Codecov Report

Merging #2651 (7a1c93f) into main (049f912) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #2651   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          163       163           
  Lines        11995     12000    +5     
=========================================
+ Hits         11995     12000    +5     

Impacted Files	Coverage Δ
src/sqlfluff/dialects/dialect_spark3.py	100.00% <100.00%> (ø)

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[tunetheweb]

One small change