fix: delimiters in rs, go, java and lua

[lvolland]

four multi-char delimiters aren't recognized, so each one swallows the rest of the line — or the file.

struct S<'a>(&'a str);

fmt.Println(`SELECT "n" FROM nums`)

--[[ block ]]

String s = """
	hello "world"
	""";

today: rust 'a reads as an unterminated char literal and eats the signature (str "'a>(msg: &'"), go backticks aren't a string at all, lua block comments only close on --]], and java text blocks split into "" + ".

expected: type, str, cmnt, str.

one rule added per language, two chars dropped from the lua one. the java rule is py.js line 23 with a literal instead of the backreference, since java has only one delimiter: /"""(\\[^]|(?!""")[^])*(""")?/g. closing delimiters stay optional so half-typed code keeps its color. +180 bytes in src, dist/ untouched, fixture lines added for all four.

notes

• rust: the lifetime rule sits before expand: 'str' on purpose. with str first, &'a str goes back to str "'a>(msg: &'". the (?!') is what keeps 'x' a char literal.
• uppercase lifetimes ('A) still fall through, same as before — didn't want to widen the rule for it.
• an unterminated """ or backtick now colors to end of file. that's the price of the optional closer.
• lua block comments now close on ]], not --]]. the --[[ ... --]] toggle idiom still works.
• no fixture line for the unterminated cases: an open text block would eat the rest of the file 🙂
• existing fixture content tokenizes byte-identically before and after.