Add IDF caching for libraries #885

Job	Run time
build (macos-latest, esp8266, gcc)	29m 5s
build (macos-latest, host, gcc)	22m 57s
build (macos-latest, rp2040, gcc)	17m 3s
build (ubuntu-latest, esp8266, gcc)	17m 35s
build (ubuntu-latest, host, clang, Host)	24m 5s
build (ubuntu-latest, host, gcc)	22m 0s
build (ubuntu-latest, host, gcc64, Host)	19m 37s
build (ubuntu-latest, rp2040, gcc)	17m 49s
build (windows-latest, esp8266, gcc)	8m 45s
build (windows-latest, host, gcc)	27m 20s
build (windows-latest, rp2040, gcc)	8m 19s
	3h 34m 35s

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