feat(stdlib) Add new parse_bytes function

[titaneric]

Summary

#49 discuss adding new function for parsing bytes, so I try to add this function here

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?

cargo test
./scripts/check.sh

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.

References

Close #49

If #1197 could be merged (also opened by me), I want to port the similar feature here to parse multiple bytes unit at once.