WIP: Reduce Explosion of Aya Error Types

[dave-tucker]

I have been down a rabbit hole of cleaning up the aya error types 😅

Most of the important changes are in errors.rs.

TL;DR

Current exposed types are:

• EbpfError
• ProgramError
• MapError
• LinkError
• PerfBufferError
• SysError

Honestly I'm still thinking about how we could collapse those types. Either into a single type, or at least fewer than we expose today.

Within each of those types, I've tried to remove any invariants that don't have any business being public (e.g if a syscall fails with -EINVAL, there is nothing at runtime you can do about it other than bailing).

👆 (and the spaghetti of errors depending on other errors) are replaced by an Other invariant that's a Box<dyn std::error::Error>.

There are still some pub(crate) XInternalError types, but these are used only to make nice error messages. This could plausibly be replaced with anyhow/context etc.. But I've left it as-is for now.

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This change is 

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[mergify[bot]]

Hey @alessandrod, this pull request changes the Aya Public API and requires your review.

[tyrone-wu]

I was wondering if the errors from aya/src/utils.rs should also be apart of this. They're technically not ebpf specific errors, but I think some parts would align with FileError.

[dave-tucker]

I was wondering if the errors from aya/src/utils.rs should also be apart of this. They're technically not ebpf specific errors, but I think some parts would align with FileError.

Good call! I missed those on the first pass through. Once I've got agreement on the general direction this PR is taking I'll go ahead and clean those up too

[mergify[bot]]

@dave-tucker, this pull request is now in conflict and requires a rebase.