Fix for issue #592, json query fix when question mark is used in data

[kamisoft-fr]

Fix places where the parameterPlaceholder is hardcoded to a question mark ?

Since the SqlResult still contained ToString method which had the hardcoded placeholder, here is what I've done:

1. Added compiler to the constructor of SqlResult
2. Made ParameterPlaceholder public
3. Added tests PostgresJsonTests

There is so a breaking change on the SqlResult class since its public, So the sqlkata version would be changed as major (2 to 3 or 3 to 4)

[aastovas]

Any update on this PR? It would be great if we could have it merged :)

[hookenful]

I highly upvote this

[ghost]

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