Allow the parser to add contextual help text to errors; Add contextual help text for parenthesized for loops

[sezna]

Given the problems users have faced with non-parenthesized for loop iterators (like this one), we wanted to provide some help text for the user in this situation.

Instead of just patching in a fix for precisely this situation, I wanted to use miette's great functionality for composable errors. So, with this change, can now compose any parse error with help text.

I also manually implemented Debug for Error to omit the help text if it isn't present. This is primarily so this PR doesn't add None to every single parser expect test which tests errors. (Happy to revert this and update the tests if desired, but I really don't like spraying the diff with 1k lines of expect-test changes that just say None)

[github-actions]

Benchmark for edf0a55

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Test	Base	PR	%
Array append evaluation	334.4±1.70µs	335.0±2.21µs	+0.18%
Array literal evaluation	186.4±2.27µs	169.3±4.28µs	-9.17%
Array update evaluation	414.8±2.68µs	415.0±2.10µs	+0.05%
Core + Standard library compilation	21.3±0.69ms	23.2±0.77ms	+8.92%
Deutsch-Jozsa evaluation	5.0±0.08ms	4.9±0.06ms	-2.00%
Large file parity evaluation	34.5±0.17ms	34.6±0.45ms	+0.29%
Large input file compilation	12.5±0.12ms	13.3±0.33ms	+6.40%
Large input file compilation (interpreter)	48.3±0.61ms	54.7±1.36ms	+13.25%
Large nested iteration	33.0±0.90ms	33.0±0.21ms	0.00%
Perform Runtime Capabilities Analysis (RCA) on Deutsch-Jozsa sample	1576.1±48.60µs	1594.2±92.51µs	+1.15%
Perform Runtime Capabilities Analysis (RCA) on large file sample	7.7±0.05ms	8.0±0.15ms	+3.90%
Perform Runtime Capabilities Analysis (RCA) on teleport sample	1444.5±55.51µs	1477.7±168.18µs	+2.30%
Perform Runtime Capabilities Analysis (RCA) on the core and std libraries	27.8±1.19ms	28.1±0.31ms	+1.08%
Teleport evaluation	92.8±3.25µs	92.7±6.09µs	-0.11%

[github-actions]

Benchmark for 6215868

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Test	Base	PR	%
Array append evaluation	337.9±5.16µs	333.9±2.85µs	-1.18%
Array literal evaluation	168.3±0.84µs	168.7±3.98µs	+0.24%
Array update evaluation	423.9±20.77µs	413.7±1.88µs	-2.41%
Core + Standard library compilation	21.1±0.91ms	21.5±0.53ms	+1.90%
Deutsch-Jozsa evaluation	5.0±0.18ms	4.8±0.04ms	-4.00%
Large file parity evaluation	34.4±0.19ms	34.0±0.21ms	-1.16%
Large input file compilation	12.6±0.24ms	12.8±0.43ms	+1.59%
Large input file compilation (interpreter)	48.4±0.72ms	49.7±1.81ms	+2.69%
Large nested iteration	33.0±0.20ms	33.0±0.25ms	0.00%
Perform Runtime Capabilities Analysis (RCA) on Deutsch-Jozsa sample	1560.7±35.75µs	1558.0±40.21µs	-0.17%
Perform Runtime Capabilities Analysis (RCA) on large file sample	7.8±0.13ms	7.8±0.27ms	0.00%
Perform Runtime Capabilities Analysis (RCA) on teleport sample	1418.1±29.84µs	1421.3±31.75µs	+0.23%
Perform Runtime Capabilities Analysis (RCA) on the core and std libraries	27.5±0.22ms	27.6±0.32ms	+0.36%
Teleport evaluation	92.0±3.11µs	92.5±7.50µs	+0.54%

[github-actions]

Benchmark for ada005d

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Test	Base	PR	%
Array append evaluation	338.1±3.97µs	337.4±2.19µs	-0.21%
Array literal evaluation	186.0±2.76µs	168.7±0.97µs	-9.30%
Array update evaluation	416.5±1.99µs	419.0±4.20µs	+0.60%
Core + Standard library compilation	21.2±0.29ms	22.2±0.54ms	+4.72%
Deutsch-Jozsa evaluation	5.0±0.07ms	4.9±0.06ms	-2.00%
Large file parity evaluation	34.3±0.14ms	34.1±0.52ms	-0.58%
Large input file compilation	12.7±0.18ms	12.9±0.32ms	+1.57%
Large input file compilation (interpreter)	49.1±0.81ms	49.1±0.75ms	0.00%
Large nested iteration	33.0±0.16ms	33.1±0.55ms	+0.30%
Perform Runtime Capabilities Analysis (RCA) on Deutsch-Jozsa sample	1555.4±28.66µs	1555.9±32.65µs	+0.03%
Perform Runtime Capabilities Analysis (RCA) on large file sample	7.8±0.04ms	7.8±0.14ms	0.00%
Perform Runtime Capabilities Analysis (RCA) on teleport sample	1416.1±31.07µs	1421.2±39.46µs	+0.36%
Perform Runtime Capabilities Analysis (RCA) on the core and std libraries	27.6±0.40ms	27.9±0.21ms	+1.09%
Teleport evaluation	92.1±3.55µs	92.0±3.36µs	-0.11%