feat: one-time code native flows

[Benehiko]

Related issue(s)

Adds Go tests and E2E cypress tests to the native login and registration via code APIs.

Improves the UX of login and registration by hiding the input fields on the second (email_sent) state. This preserves the nodes in the API allowing the consumer to still display the fields however they would like. In the Account Experience these fields won't show up to the end-user and will be submitted along with the code.

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Merging #3516 (3325ce7) into master (6b91dc1) will increase coverage by 0.00%.
Report is 3 commits behind head on master.
The diff coverage is 86.58%.

❗ Current head 3325ce7 differs from pull request most recent head 85f5f81. Consider uploading reports for the commit 85f5f81 to get more accurate results

@@           Coverage Diff           @@
##           master    #3516   +/-   ##
=======================================
  Coverage   78.20%   78.20%           
=======================================
  Files         341      341           
  Lines       22767    22772    +5     
=======================================
+ Hits        17804    17809    +5     
  Misses       3624     3624           
  Partials     1339     1339           

Files	Coverage Δ
identity/test/pool.go	100.00% <100.00%> (ø)
selfservice/strategy/code/strategy.go	81.53% <100.00%> (+0.73%)	⬆️
identity/handler.go	85.32% <50.00%> (ø)
persistence/sql/identity/persister_identity.go	80.68% <81.39%> (ø)

[aeneasr]

All e2e tests are failing :/

[Benehiko]

hmm i'll have to take a look tomorrow. We still need to get the latest changes of Elements in AX for the best experience though, so this shouldn't be merged yet.

[aeneasr]

Code tests are still failing :(

What can I do to help get this over the finishing line?

[Benehiko]

the tests are failing because we need some changes in ory elements ory/elements#150
I'm working on it. But tbh the PR can be reviewed already