MCC-1365296 rewrite as java wrapper

[colinphill-mdsol]

See #33. This new PR has a different branch name to auto-link to the appropriate Jira ticket.

Differences from that PR:

• The test suite is vendored instead of included as a submodule. This sidesteps a problem in the CI build where it failed to check out the submodule. It's also just a lot easier to work with.
• The old implementation has not been deleted. It is still included so that we can do a gradual switchover.
• The version is tagged as an alpha. This means we don't need to commit to the API as it stands now, and can make breaking changes if needed. Gives us time to try it out. It also means we don't need to have all the documentation polished and ready for external users yet.

[gitguardian]

⚠️ GitGuardian has uncovered 2 secrets following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secrets in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
330827	Triggered	RSA Private Key	a3a7314	mauth-protocol-test-suite/signing-params/rsa-key	View secret
329054	Triggered	RSA Private Key	6d6b8c9	src/com/mdsol/mauth/clojure/client.clj	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Revoke and rotate the secret.

---

^{🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.}

[colinphill-mdsol]

Once again, false positive GitGuardian checks. Those are both testing keys.

[mmajumdar-mdsol]

@colinphill-mdsol
In request.clj, currently the make-request function is encoding the response body as string by this line
(update response :body json/write-str).
So UI is receiving a double encoded string , as BE is already sending an encoded string, and mauth-client is also updating the response body to string.
So can we remove that code in this PR, this will take care of passing the BE response to UI verbatim.