Removes GK auth extension dependency

For upcoming premium features

Adds unit testing (just for the trie for now)

Consolidates to node-fetch 2.6.7 as Octokit requires v2

Adds image minify webpack config for debugging

Reorganizes local git support to exclude from web
Swaps sha1 usages to md5 to avoid needing sha1 on the web (md5 is required by Gravatar)
Avoids crypto-browserfy and imports md5.js directly
Uses platform crypto for random nonce strings

Adds anti-trojan-source eslint rule
Improves typescript config for eslint import

Updates dependencies

Switches to use ansi-regex
Updates to Typescript 4.5-rc
Simplifies the SubPath type
See https://github.com/microsoft/TypeScript/issues/46643#issuecomment-957987115

Switches to use new context.extension