feat(server): make it possible to POST custom typings for testing during typing creation

[Vampire]

With this you can for example do curl --data-binary @action-types.yml https://bindings.krzeminski.it/pbrisbin/setup-tool-action/v2/setup-tool-action-v2.pom then get as result coordinates containing a UUID in the group field which you can then use for an hour (or from the Maven Local cache thereafter) to test with the supplied typing.

[Vampire]

• #1602 👈 (View in Graphite)
• #1646 : 3 other dependent PRs (#1608 , #1609 , #1610 )
• main

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