Merge similar enhancement rules

[Swatinem]

This is spawned out of #51354.

The main loop of enhancement rules looks like this:

sentry/src/sentry/grouping/enhancer/__init__.py

Lines 128 to 132 in ad474a7

	for rule in self._modifier_rules:
	for idx, action in rule.get_matching_frame_actions(
	match_frames, platform, exception_data, cache
	):
	action.apply_modifications_to_frame(frames, match_frames, idx, rule=rule)

It iterates over each rule, and then over each action for a matching rule.
This can be suboptimal for multiple consecutive rules with similar matchers and the same actions, for example:

family:native function:_CxxThrowException                         ^-group -group ^-app -app
family:native function:__cxa_throw                                ^-group -group ^-app -app

In this case, we would execute both matchers, and up to 4 of the rules if a matcher is indeed matching.

There are two possibilities to optimize this:

Merge consecutive matchers with the same actions

In the example above, the two enhancers can be merged into one, matching a function name of either _CxxThrowException or __cxa_throw.

Merge directional actions

Right now, ^-group -group is treated as two separate actions, upwards (less), and equal. It should be possible to merge these into a single action "less or equal".