[credentialhelper] Add types to communicate with the subprocess #15844
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This change adds
GetCredentials{Request,Response}
, which we'll use topass data in
stdin
to the credental helper subprocess, and read theresponse from
stdout
of the subprocess.Progress on https://github.com/bazelbuild/proposals/blob/main/designs/2022-06-07-bazel-credential-helpers.md#proposal
Closes #15803.
PiperOrigin-RevId: 459701706
Change-Id: Icbd9fc491546ee5599d5a9d04680671b06a91a85