Added the scripting feature

Added the feature to process a request/response with a script

Breakpoints feature; Rules import/export; Manifest v3

• Global code refactoring;
• Migrated to Manifest v3;
• Added breakpoints feature;
• Added rules import/export feature;

Fixed exception on a post data modify with Chrome 68

Fix for #8

Fixed bug with an empty response

Fixed bug with an empty response (cleans by Netify) when defined some mutation with of response, but respnse body stay original.

Fully rewritten; New design; New features;

The extension codebase has been fully rewritten 🤗

New features

• New main UI side-by-side layout
• Improved rules list: added "switch on/off" feature, added a rule label (aka "name") feature. Cleaner and more concise design.
• Improve the rule details view.
• Improved compose: redesigned structure, more clean.

Refactored

• Rewritten internal logic of working with requests: applied "Fetch" devtools protocol domain instead deprecated "Network".
• Refactored store with usage "effector"