Refactor is_wc_cat_id_start math symbol list

[savq]

• Check ∂, ∃, ∄, ∅, ∆, ∇ and ∎, ∏, ∐, ∑ in two ranges, instead of comparing wc to each one individually.
• Check ∟ with the rest of the angle symbols.
• Check ∞ at the beginning with the other symbols that are not in any range.
• Check integral symbols in a separate range.
• Move angle symbols inside the big check (they're in the range 0x2140:0x2a1c)
• Move some symbols to match lexicographical order.

This commit does NOT add any new characters.

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Motivation:

• When new characters get added, they usually get checked individually instead of adding new character ranges. (for example parse unicode forall and exists as identifiers #42314).
• Keeping the logic simple here helps 3rd party parsers. A discussion in tree-sitter-julia is what prompted this PR. Lezer-julia also mantains a javascript version of these functions
• It makes it easier to see "gaps" in the valid characters. For example ∁ (U+2201 COMPLEMENT) or the integrals in the range 0x2a17:0x2a1a could probably be added as characters (I'm not advocating that more characters get added, I'm just pointing it out).