…ct#4490)

#### What type of PR is this?
Feature which adds OIDC refresh token caching in armadactl.

#### What this PR does / why we need it:

Adds token caching for OIDC auth so you don't have to authenticate in
the browser every single time you run armadactl.

Currently it's super annoying - every command opens the browser for
auth.
This PR fixes that by securely caching the refresh token in your system
keyring (Keychain on mac, etc).
After you auth once, subsequent commands just work without the browser
popup.

The implementation is secure - only uses the OS keyring, never falls
back to files.
If there's no keyring available, caching just gets disabled.

To use it, just add `cacheRefreshToken: true` to your context in
`~/.armadactl.yaml`:

  ```yaml
  contexts:
    my-context:
      cacheRefreshToken: true
      openIdAuth:
        providerUrl: "http://localhost:8180/realms/armada"
        clientId: "armada-server"
        localPort: 8085
        scopes: ["openid", "profile", "email", "offline_access"]
```

Make sure to add `offline_access` scope so refresh token is returned from the IDP.

#### Which issue(s) this PR fixes:

Fixes armadaproject#4487

#### Special notes

`armadactl` MUST be built with `CGO_ENABLED=1` for this to work properly.

Signed-off-by: Dejan Zele Pejchev <pejcev.dejan@gmail.com>
Signed-off-by: Sigele Nickerson-Adams <sigele.nickerson-adams@nmc2.ai>