Object Literals

[alanmcruickshank]

This resolves #3606 .

Quite a few other things going on here though. The way that literals and expressions were being referenced wasn't very DRY, with many dialects redefining LiteralGrammar. In resolving some of those dependencies we also needed a better way of identifying offending grammars during debugging - so I've added a crumbs keyword to simple, which catches infinite recursion early and outputs the offending loop. The magic for that is in Ref.

Otherwise this is mostly the knockon effects of updating LiteralGrammar to include objects and then deduping elsewhere.

[tunetheweb]

LGTM if you can fix the failing test cases

[barrywhart]

Some of the test failures are complaining about rule 48. Not sure why:

Message: '[L048] No config_keywords defined for L048'
Rule_L048' object has no attribute 'config_keywords'

[codecov]

Codecov Report

Merging #3620 (4824584) into main (d83ab36) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #3620   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          175       175           
  Lines        13255     13261    +6     
=========================================
+ Hits         13255     13261    +6     

Impacted Files	Coverage Δ
src/sqlfluff/dialects/dialect_athena.py	100.00% <ø> (ø)
src/sqlfluff/dialects/dialect_hive.py	100.00% <ø> (ø)
src/sqlfluff/dialects/dialect_postgres.py	100.00% <ø> (ø)
src/sqlfluff/dialects/dialect_snowflake.py	100.00% <ø> (ø)
src/sqlfluff/dialects/dialect_tsql.py	100.00% <ø> (ø)
src/sqlfluff/dialects/dialect_ansi.py	100.00% <100.00%> (ø)

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