Improve parsing of numeric literals in the Sparql parser

[Qup42]

Numeric Literals are now parsed into variant<int64_t, double>. Cleaned up the code that previously handled the numeric literals Any. AFAIK to be standard compliant we'd need integers with arbitrary size. So removing 1 Bit in the unsigned case shouldn't make that big of a difference. Even more so since they already were converted to int64_t in some cases.

TODO:

• touch up of the NumericLiterals tests

[joka921]

Yes, QLever will (for efficiency reasons) probably never implement arbitrary precision, and we currently even lose more than 1 bit (currently 4) in the implementation (but this might not be forever).

[joka921]

Thank you very much,
I think all of my comments are minor, the general design is already very good!
Most notably, while reviewing this I have found once again how hard it is to do stuff properly .

[joka921]

Very nice and much cleaner,
only two small cleanup suggestions.

[joka921]

Thank you very much, this looks much cleaner now.
I'll have a look at that test failure (I am sure that it's nor your fault),
and then I'll merge this.