[sql] Consider using regex source generator

[alanwest]

Discussed here in the context of parsing sql connection details: #2233 (comment)

There is a RegEx source generator available now. Doesn't have to be part of this PR, but we should probably move to that on targets where it is available. Reason being is I assume it gives best perf across the board but especially when AoT is in play and compilation is not available (assuming RegEx falls back to interpreter when dynamic code isn't available).

Some reasons listed here why it should be used:
https://learn.microsoft.com/dotnet/standard/base-types/regular-expression-source-generators#when-to-use-it