feat: add global variables for all query fields

[fnoopv]

As discussed in go-goyave/goyave#242, QueryParamPage and QueryParamPerPage are added to change the current page number field name and the data size per page field name in pagination parameters.

[System-Glitch]

While we're at it, can we do this for all the query parameters? (filter, or, search, sort etc) This would give maximum flexibility to the users of this library.

[fnoopv]

While we're at it, can we do this for all the query parameters? (filter, or, search, sort etc) This would give maximum flexibility to the users of this library.

No problem, I'll add them later

[fnoopv]

Should we add a FieldName field at the end of all fields to better express the function of the field? The current field name may be ambiguous, for example, QueryParamPerPage may be more like setting the size of PerPage, change to QueryParamPerPageFieldName may be better

[System-Glitch]

Should we add a FieldName field at the end of all fields to better express the function of the field? The current field name may be ambiguous, for example, QueryParamPerPage may be more like setting the size of PerPage, change to QueryParamPerPageFieldName may be better

I'm fine with QueryParamPerPage.

[System-Glitch]

I left a few recommendations for the documentation. Otherwise it looks good to me! Thank you very much! 👍🏻

[coveralls]

Pull Request Test Coverage Report for Build 13654836363

Details

• 20 of 20 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.043%

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Totals
Change from base Build 13284264438:	0.0%
Covered Lines:	931
Relevant Lines:	940

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💛 - Coveralls

[System-Glitch]

Thank you! 🎉