feat!: Add masterkey as credential option #2276

Job	Run time
Typos	5s
Build docs (stable, macos-latest)	2m 23s
Test (stable, macos-latest)	2m 20s
Build docs (stable, windows-latest)	2m 1s
Clippy	2m 18s
Test (stable, ubuntu-latest)	2m 19s
Test (stable, windows-latest)	2m 7s
Rustfmt	8s
Build docs (stable, ubuntu-latest)	1s
Result (CI)	1s
	13m 43s

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