Replace remerkleable with eth-ssz-specs - #5520
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This PR removes the SimpleSerialize (SSZ) specifications from this repository. These specifications now exist in the [`ethereum/ssz-specs`](https://github.com/ethereum/ssz-specs) repository. This PR should be merged before #5520.
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This PR removes the SimpleSerialize (SSZ) generic tests from this repository. Tests for SSZ libraries now exist in the [`ethereum/ssz-specs`](https://github.com/ethereum/ssz-specs) repository. This PR should be merged before #5520.
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The new SSZ library (see #5520) does not currently provide a way to `sum()` set bits. Instead of replicating this functionality in `eth-ssz-specs`, I think we should introduce a new helper function for this. Using `sum()` here is a bit too pythonic and a new reader might not understand what it's doing. An explicit helper function would clear that up.
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This PR takes the final step in replacing Remerkleable with a new SSZ library which is all-around better. The new library,
ethereum/ssz-specsis ~2x faster, supports thetytype checker, and supports some nice features like slicing. When reviewing, please do not worry much about the changes topysetupas I intend to rewrite this from scratch soon. This PR also removes the SSZ specs/tests (egssz_generic) here, sincessz-specsis intended to serve that purpose.Related to #5465.