feat(functions): Enable true regex replacement for the regexReplacement option (#2341)

* Adding regex capabilities to ParseFunctionCall replacement

Signed-off-by: Lenaxia <github@47north.lat>

* Adding tests for the regex replace in ParseFunctionCall

Signed-off-by: Lenaxia <github@47north.lat>

* Fixing tests and adding a test case to validate double quote replacement works

Signed-off-by: Lenaxia <github@47north.lat>

* Make Regex replacement stable, drop lookaheads

Signed-off-by: mudler <mudler@localai.io>

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Signed-off-by: Lenaxia <github@47north.lat>
Signed-off-by: mudler <mudler@localai.io>
Co-authored-by: Lenaxia <github@47north.lat>
Co-authored-by: mudler <mudler@localai.io>