perf: merge several style syntax linters

[grunweg]

Does this improve performance? To be determined!

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Opening just for benchmarking purposes. Would need clean-up before it can be merged.

[github-actions]

PR summary 9bf1d50992

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

+ cdotLinter.findErrors
+ jointSyntaxLinter
++++ findErrors
- setOptionLinter

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[grunweg]

Benchmarking this, once CI is done, would be welcome.

[grunweg]

!bench

[leanprover-bot]

Here are the benchmark results for commit 9bf1d50.
There were no significant changes against commit b5fb043.

[adomani]

I don't know what happened to the bench summary bot: locally, it prints

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File	Instructions	%
build	-253.872⬝10⁹	(-0.17%)
Mathlib.Tactic.Linter.Style	+1.584⬝10⁹	(+23.57%)

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