fix(parser): Parse more than utf8

[sishtiaq]

fix(parse): Extend parser to parse more than UTF-8 (#954).

sqlite3.c has a char table that needs to be parsed. This PR allows non-UTF-8 to be parsed too. The three chars {\n,\t,"} are still printed as human-readable, even if their corresponding hex codes are parsed.

The main change is that Parser.parseStringLiteral now returns a ByteArray, rather than a String. Some of the previous uses (AttrParser, MlirParser) converted to Byte anyway; these calculations have now gone.
On the other hand, UnitTest/Parser has a wrapper to convert to String for comparison.

[github-actions]

VeIR Benchmarks

Details

Benchmark suite	Current: fcbeb63	Previous: 1971543	Ratio
add-fold-worklist/create	1881000 ns (± 69769)	2264000 ns (± 89652)	0.83
add-fold-worklist/rewrite	3599000 ns (± 57399)	4027000 ns (± 79991)	0.89
add-fold-worklist-local/create	1863000 ns (± 27568)	2225000 ns (± 106345)	0.84
add-fold-worklist-local/rewrite	3362000 ns (± 86170)	3716000 ns (± 61682)	0.90
add-zero-worklist/create	1868000 ns (± 62051)	2226000 ns (± 51046)	0.84
add-zero-worklist/rewrite	2235000 ns (± 20681)	2600000 ns (± 51267)	0.86
add-zero-reuse-worklist/create	1576000 ns (± 55623)	1889000 ns (± 90843)	0.83
add-zero-reuse-worklist/rewrite	1866000 ns (± 94180)	2127000 ns (± 49138)	0.88
mul-two-worklist/create	1932500 ns (± 96028)	2209000 ns (± 62608)	0.87
mul-two-worklist/rewrite	5095500 ns (± 185066)	5620000 ns (± 248024)	0.91
add-fold-forwards/create	1896000 ns (± 90378)	2279000 ns (± 74547)	0.83
add-fold-forwards/rewrite	2715000 ns (± 61249)	3063000 ns (± 51863)	0.89
add-zero-forwards/create	1899000 ns (± 38004)	2163000 ns (± 99039)	0.88
add-zero-forwards/rewrite	1790000 ns (± 24509)	1940000 ns (± 16682)	0.92
add-zero-reuse-forwards/create	1551000 ns (± 32898)	1902000 ns (± 49987)	0.82
add-zero-reuse-forwards/rewrite	1402000 ns (± 19942)	1574000 ns (± 33890)	0.89
mul-two-forwards/create	1868000 ns (± 10040)	2239000 ns (± 86176)	0.83
mul-two-forwards/rewrite	3279000 ns (± 71965)	3723000 ns (± 102624)	0.88
add-zero-reuse-first/create	1583500 ns (± 55205)	1837000 ns (± 97092)	0.86
add-zero-reuse-first/rewrite	10000 ns (± 2251)	8000 ns (± 1821)	1.25
add-zero-lots-of-reuse-first/create	1568000 ns (± 57395)	1924000 ns (± 83197)	0.81
add-zero-lots-of-reuse-first/rewrite	790500 ns (± 61209)	801000 ns (± 13405)	0.99

This comment was automatically generated by workflow using github-action-benchmark.

[math-fehr]

Thanks a lot! I added a few comments, but otherwise all good.

[sishtiaq]

I've addressed all comments @math-fehr @GZGavinZhao. If you can have a check, and put the PR in to the merge queue please.

[math-fehr]

Thanks, that looks good to me, I'll just wait for @GZGavinZhao to review it then I can merge it!

[GZGavinZhao]

Looks great! Thanks for implementing this. Just a small error message improvement suggestion, then should be good to merge!

[math-fehr]

Thanks!