Adding OIDC token & parsed OIDC user as Action outputs

[carmithersh]

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• I used npm run format for formatting the code before submitting the pull request.

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Resolves #128
Supercedes #148

Add the OIDC token and parsed OIDC user as outputs of the Setup JFrog CLI action, so they can be utilized in non-CLI actions within the workflow.

Example usage:

- name: Setup JFrog CLI
  id: setup-jfrog-cli
  uses: jfrog/setup-jfrog-cli@v4
  env:
    JF_URL: ${{ secrets.JFROG_PLATFORM_URL }}
  with:
    oidc-provider-name: ${{ env.OIDC_PROVIDER_NAME }}

- name: Authenticate Docker
  uses: docker/login-action@v3
  with:
    registry: ${{ secrets.JFROG_PLATFORM_URL }}/docker
    username: ${{ steps.setup-jfrog-cli.outputs.oidc-user }}
    password: ${{ steps.setup-jfrog-cli.outputs.oidc-token }} 

[yahavi]

Well done @carmithersh!

Please also document this feature in the README.