Migrate keychain to use non-CGO libraries

[tylercreller]

• Refactors keychain keyring storage to use a non-CGO library
• Adds tests for keychain, wincred, pass
• Modifies PR check CI to have separate runs per platform for keyring tests

[macgregor]

for context, why do we want to use a non-CGO library?

[tylercreller]

for context, why do we want to use a non-CGO library?

@macgregor CGO breaks cross-compilation. Requiring CGO for our CLIs requires workarounds for cross-compilation or building darwin binaries on dedicated macOS CI runners. For ROSA this is a large amount of overhead due to their current release processes.

[cristianoveiga]

LGTM