add API server-reload-ui and server-reload-script-bodies

[w-e-w]

Description

Add 2 api route
/sdapi/v1/server-reload-ui
/sdapi/v1/server-reload-script-bodies
same function as these Reload UI and Reload custom script bodies (No ui updates, No restart) buttons

similer to the existing api rounts
/sdapi/v1/server-stop /sdapi/v1/server-restart /sdapi/v1/server-restart

note only available if --api and --api-server-stop is used

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context

some settings needs reload ui to apply, but it only does is update the UI visually and so does not really impact API use
but there are some settings that goes deeper such as control_net_unit_count, this setting dose need reload ui as it will correctly corresponding inputs for the API, and some reloading in these cases are important

it is possible to just Restart UI, but this is slower then just reloading the UI, (also sometimes restarting is not available)
so I see no reason why we shouldn't add /sdapi/v1/server-reload-ui for those cases that actually do need it

/sdapi/v1/server-reload-script-bodies it's just something I decide to also Implement because why not (I'm not sure how useful is this one)

• Setting control_net_unit_count via sdapi/v1/options to 4 changes the the value in the remote UI but only enables 3 when running a prompt #16742

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests

[w-e-w]

found issue
/sdapi/v1/server-reload-ui dose not work in api only mode / --nowebui

existing routes
/sdapi/v1/server-restart /sdapi/v1/server-stop also have the same issue