Support reorg subscription

[FabijanC]

Usage related changes

• Address partially JSON-RPC API 0.8.0 adaptation #613

Development related changes

• Only check for changes if request requires so (introduce new method for this: requires_notifying).
  • The new method relies on clippy warning to be issued if wildcard matching used, to force explicitly defining behavior for each request: wildcard_enum_match_arm.
• Refactor Subscription::matches method to avoid using if.
• Make abort_blocks a method of BackgroundDevnet and use it where possible instead of sending custom requests.

Checklist:

• Checked out the contribution guidelines
• Applied formatting - ./scripts/format.sh
• No linter errors - ./scripts/clippy_check.sh
• No unused dependencies - ./scripts/check_unused_deps.sh
• No spelling errors - ./scripts/check_spelling.sh
• Performed code self-review
• Rebased to the latest commit of the target branch (or merged it into my branch)
  • Once you make the PR reviewable, please avoid force-pushing
• Updated the docs if needed - ./website/README.md
• Linked the issues resolvable by this PR - linking info
• Updated the tests if needed; all passing - execution info