analyzer: Warn about potentially incorrect pseudo-positional arguments processing

[DeagleGross]

Dapper.Vanilla will incorrectly process ? symbol assuming its a syntax for pseudo-positional arguments even when it is used in the SQL string. I.e:

select 'this ?looks? like pseudo-positional'

Added the processing step for StringLiteral in TSqlProcessor where we report a diagnostic only if criterias below are met:

1. string contains 2 question marks
2. string contains 2 question marks in AsciiStringLiteral only
3. CompiledRegex.PseudoPositional regex returns true

IIRC we decided not to report diagnostic for OLE Db smell check.

Closes #60

[DeagleGross]

TODO:

• [x] detect specific SQL parse failure and ignore it\
• [x] overcome the warning Parameter 'Id' is not used, but will be included
• • run PseudoPosArg regex after variables are assigned, and if there is something - mark it as used