EIP 4844 - blobhash opcode (part 1)

[r0qs]

Depends on #14743 (merged)
First part of #14740

This PR implements the blobhash opcode as specified in the EIP-4844 and add tests for assembler mode. The opcode is not exposed to Solidity in this part; that will be addressed in part 2. While it's intended to be non-breaking, additional tests may be required.

[cameel]

This is missing a changelog entry (we usually add a separate one for the opcode and for high-level support in Solidity). Also, the bits of docs from #14759 describing the opcode should really be in this PR.

Other than that I did not find any serious problems. Mostly small things, easy to tweak. I added a fixup to deal with some of it, the rest is in comments.

Since the evmone update is now merged, I rebased the PR on develop.

[cameel]

I looked through all the uses of the already existing blockhash() to make sure we're not forgetting anything we should have for blobhash() here and found only one minor test that might need it.

Other than that, we actually should change #14757 (comment) back (I'll post details in a moment). EDIT: Actually it's fine. I wanted to note that the variable assigned to the pointer will go out of scope, but it's static so it's fine.

I'm going to look through #14759 before approving this in case something from there should still end up in this PR, but if not, we'll be done here.

[nikola-matic]

Aside from the one question I left (which is important, at least for me), looks good.

[cameel]

Oh, one more thing, let's finally stop messing with the spacing in the changelog :)

Suggested change

	* Yul: Introduce builtin ``blobhash()`` for retrieving versioned hashes of blobs associated with the transaction.
	* Yul: Introduce builtin ``blobhash()`` for retrieving versioned hashes of blobs associated with the transaction.

I fixed it earlier in all those PRs but it keeps reappearing again and again for some reason. Don't worry about the wrong spacing of the Compiler Features: section. We'll fix it when we sort the changelog. In PRs just add an entry for your PR and don't touch other lines.