Adds timings to webpack icon font generation

Ensures classname don't get mangled

- Adds `gitlens.experimental.openChangesInMultiDiffEditor` and requires `multiDiffEditor.experimental.enabled` to also be set

- Avoids importing tons of types into the module

Attempts to improve perf will better parallel i/o

Consolidated log into log2 calls (and renames it)

- As fast as esbuild minification but with better results than terser

Adds default (60s) timeout to fetch requests
Refs #3013

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