enhancement(lz4_decode) add lz4_decode compression type detection

[jimmystewpot]

Summary

In a previous PR #1339, LZ4 block compression was added. That change focused on adding LZ4 block compression and decompression support. With Lz4, there are two types of compression: frame and block. This change supports detecting if the value being decoded is compressed using LZ4 frame compression and attempts to handle it gracefully.

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

How did you test this PR?

I have run through the various scripts in scripts and added an additional test to decompress an LZ4 frame payload.

Does this PR include user-facing changes?

• Yes. Please add a changelog fragment based on
  our guidelines.
• [] No. A maintainer will apply the "no-changelog" label to this PR.

Checklist

• Our CONTRIBUTING.md is a good starting place.
• If this PR introduces changes to LICENSE-3rdparty.csv, please
  run dd-rust-license-tool write and commit the changes. More details here.
• For new VRL functions, please also create a sibling PR in Vector to document the new function.