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Add `toolcache.ts` script for `bundle(-from)-toolcache` checks #479

Job	Run time
Per-language bundles (go, ubuntu-latest, nightly-latest, autobuild)	1m 0s
Per-language bundles (java, ubuntu-latest, nightly-latest, none)	56s
Per-language bundles (python, ubuntu-latest, nightly-latest)	42s
Per-language bundles (javascript, ubuntu-latest, nightly-latest)	57s
Per-language bundles (rust, ubuntu-latest, nightly-latest)	1m 47s
Per-language bundles (cpp, ubuntu-latest, nightly-latest, manual, gcc -o main main.c)	45s
Per-language bundles (ruby, ubuntu-latest, nightly-latest)	39s
Per-language bundles (csharp, ubuntu-latest, nightly-latest, none)	55s
Per-language bundles (actions, ubuntu-latest, nightly-latest, actions javascript)	52s
Per-language bundles (swift, macos-latest-xlarge, nightly-latest, autobuild)	8m 16s
	16m 49s