feat(oauth): Use keyring to store oauth token

[burmudar]

use keyring to store oauth token

add internal/keyring package to use 99designs keyring

• rename keyring to store
• make keyring struct src-cli and set label on secret

return Token struct

store token in keyring

create token struct from TokenResponse

• Token converts expiresIn to a timestamp
• Store the token with the endpoint suffix

add basic http transport for oauth

OAuth transport and use when available in api client

Test plan

[burmudar]

This change is part of the following stack:

• #1223
  • #1227
    • #1228 ◀

_{Change managed by git-spice.}