chore(releasing): improve release/create_release_pull_request.py script

[pront]

Summary

• allow passing minor to automatically bump to the next version
• use toml library to read and edit version
• add --issue argument

Dry run:

  Bumping patch version: 0.28.0 -> 0.28.1
  Creating branch: prepare-0.28.1-release
  Dry-run mode: Skipping branch creation.
  Updating version in Cargo.toml: 0.28.0 -> 0.28.1
  Dry-run mode: Skipping version file write and commit.
  Generating changelog...
  Dry-run mode: Skipping changelog generation and commit.
  Creating pull request with title: chore(releasing): Prepare 0.28.1 release
  Dry-run mode: Skipping PR creation.

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?

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