Handle escaping the dangling right ] and right } in the regexp transpiler

[NVnavkumar]

Fixes #9224.

This enables the transpiler to automatically escape ] and } when they have no left component. This ensures that they will run in optimized form when regex is not required, and will be escaped properly for cuDF.

[NVnavkumar]

build

[jlowe]

Looks like a couple of unit test failures:

[2023-09-13T22:58:51.054Z] - not a quantifier *** FAILED ***
[2023-09-13T22:58:51.054Z]   RegexSequence(ListBuffer(RegexChar('{'), RegexChar('1'), RegexEscaped('}'))) did not equal RegexSequence(ListBuffer(RegexChar('{'), RegexChar('1'), RegexChar('}'))) (RegularExpressionParserSuite.scala:53)
[2023-09-13T22:58:51.054Z]   Analysis:
[2023-09-13T22:58:51.054Z]   RegexSequence(parts: ListBuffer(2: RegexEscaped('}') -> RegexChar('}')), position: Some(value: 0 -> ))

[2023-09-13T22:58:51.055Z] - character classes containing ']' *** FAILED ***
[2023-09-13T22:58:51.055Z]   RegexSequence(ListBuffer(RegexCharacterClass(false, ListBuffer(RegexChar('a'))), RegexEscaped(']'))) did not equal RegexSequence(ListBuffer(RegexCharacterClass(false, ListBuffer(RegexChar('a'))), RegexChar(']'))) (RegularExpressionParserSuite.scala:109)
[2023-09-13T22:58:51.055Z]   Analysis:
[2023-09-13T22:58:51.055Z]   RegexSequence(parts: ListBuffer(1: RegexEscaped(']') -> RegexChar(']')), position: Some(value: 0 -> ))

[NVnavkumar]

build

[revans2]

Okay so because there is nothing in front of the {1} that we do not parse it as a repetition.