feat: consider RLE blocks in compatibility check starting from V9

[Thegaram]

Purpose or design rationale of this PR

Enable #64 starting from codecV9.

See also discussion.

PR title

Your PR title must follow conventional commits (as we are doing squash merge for each PR), so it must start with one of the following types:

• feat: A new feature

Breaking change label

Does this PR have the breaking-change label?

• No, this PR is not a breaking change
• Yes

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[Copilot]

Pull Request Overview

This PR enables support for RLE (Run-Length Encoding) blocks in the compressed data compatibility check for codec version 9. The change introduces a new compatibility check function checkCompressedDataCompatibilityV9 that handles RLE block types, which were previously unsupported.

Key changes:

• Added checkCompressedDataCompatibilityV9 function that properly handles RLE blocks (type 1) in addition to compressed blocks
• Created DACodecV9 struct that overrides all methods transitively calling the compatibility check to use the V9 version
• The V9 codec now accepts both RLE blocks and compressed blocks (types 1 and 2), rejecting only reserved block type 3

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
encoding/da.go	Adds new checkCompressedDataCompatibilityV9 function with RLE block support
encoding/codecv9.go	Implements DACodecV9 struct with overridden methods to use V9 compatibility check

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[jonastheis]

Looks good to me (checked with a diff to CodecV8).

Just to clarify:
Once Galileo activates we start creating batches with CodecV9 and potentially with RLE blocks. This is fine as l2geth will then (after Galileo) recreate the same batches with RLE blocks. Compression is unmodified and should work in either case.