Add galasactl secrets set command

[eamansour]

Why?

See galasa-dev/projectmanagement#1467

Changes

• Added galasactl secrets set command to create and update secrets in a Galasa service
  • Includes --username, --password, and --token flags to provide unencoded credentials, and base64-equivalents to provide base64-encoded credentials (e.g. --base64-username, --base64-password, etc.)
  • Added --type flag to be able to change the type of an existing secret

This PR builds upon changes in #301 and #300 - those PRs should be delivered first, then this PR can be rebased to remove the duplicate changes

Builds for this PR will fail until galasa-dev/framework#662 is delivered

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