feat(@lexical/devtools): Extracted store/messaging implementation to the separate packages

[StyleT]

Reasoning:

• This adds strongly types RPC API for communication between extension surfaces (devtools / injected script / popup / background)
• It moves store synchronization implementation to the unified transport layer (instead of relying on ad-hoc patches of the existing libraries)
• We remove code that is unrelated to the Lexical DevTools from the repo to streamline communication stack development and keep examples/tests/infra outside of Lexical. So errors like this one: https://github.com/serversideup/webext-bridge/pull/83 can be fixed outside of Lexical.

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