feat(nbt): update number parsing for 1.21.5

[kennytv]

Adds support for:

• completely random underscores within the numbers 💩,
• hexadecimal and binary numbers,
• the new signed/unsigned suffix.

This makes -0xabsL or 2____2_____________________________________________________________________________________________________________________________________________________________________________________________________2 valid numbers. In more cases, it may be more lenient than vanilla where it would error, but it should accept what needs to be accepted. I opted to change the existing code with Java number parsing instead of implementing a full blown grammar around scientific notation like Minecraft does 🐥

Does not include changes for number array mixing ([L; 1l, 2i, 3b, 4]) or the escape changes, though I might try to do the first later in a separate PR