Add `get_public_key` for `StrongholdStorage` (#1311) #4817

Job	Run time
check-for-run-condition	1s
check-for-modification	3s
build-wasm / build-wasm (ubuntu-latest)	3m 44s
build-and-test (ubuntu-latest)	17m 33s
build-and-test (macos-latest)	26m 23s
build-and-test (windows-latest)	16m 48s
test-wasm (ubuntu-latest)	4m 24s
	1h 8m 56s

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