feat: Support hexadecimal floating point literals

[MaxGraey]

Examples

0x1.999999999999ap-4
-0X0.1P4
-0x1A.p+100

Motvation

• Hexadecimal float pointing literals can represent float points exactly without complicated and expensive parsing. It's quite useful for math calculations;
• Hexadecimal float pointing format supported in many languages (C, C++, Julia and etc). Therefore, support for this format makes it easier migration;
• Hexadecimal float pointing format supported by WebAssembly spec. And since we support the same things as WebAssembly, it makes sense to add support to the language itself.

As always, the TS language doesn't support such literal format, so as usual we can use the standard way (@ts-ignore) to mute ts checker.

Firstly, we need to add built-in literal templates like:

f64`0x1.999999999999ap-4`
i32`123`

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