Feature: Support workflow event dispatch via API

[wxiaoguang]

Fix: #31765 (Re-open #32059)

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Major changes after #32059

1. remove WorkflowAPI interface because these route handlers are not reused, it's not like the other one besides it.
2. use golang err handling approach (wrap&as) to process errors with locale
3. remove unnecessary workflowID != "" check because the path param can't be empty if the handler has been routed to.
4. fix path & query escaping
5. fix error handling (NotExisting -> 404)
6. use "map[string]string" for "inputs" (before it used "any" which seems too relax and might cause problems)
7. decouple web Context (it should never manually construct any web/api Context)
8. update comments and reformat some tests

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Co-authored-by: Bence Santha git@santha.eu
Co-authored-by: Christopher Homberger christopher.homberger@web.de

[ChristopherHX]

I agree your Locale Wrap approach looks better

[ChristopherHX]

I think I have added the nil check in the callback to have the opportunity to later reject inputs not defined for the workflow, but since this is not implemented removing this is ok

[wxiaoguang]

I think I have added the nil check in the callback to have the opportunity to later reject inputs not defined for the workflow, but since this is not implemented removing this is ok

Hmm, I thought that we could reject the inputs in the outer caller function, then no need to check nil in every "processInputs" callback. Does it seem good?

[ChristopherHX]

I thought that we could reject the inputs in the outer caller function
Does it seem good?

Yes we can do it like this, if we set all values into the map provided to the function. Just had different thoughts in my mind this is fine.

Another open detail I left behind has been case insensitivity of inputs. Technically is should be ok to pass INPUT to an input with name Input. (Not relevant for the UI)

[ChristopherHX]

I just tested github.com, they are ignoring content-type: application/x-www-form-urlencoded and don't like formdata.

Gitea ignores json if this header is found

gh cli also converts form to json on the fly before making the call

[ChristopherHX]

LGTM