[Enh] : Let's add a `searchFrom` for search providers.

[nfebe]

Some search filters/providers need to search from multiple places for example as in #50550 dav app search provider needs to search from events, contacts ...

• searchFrom should probably be an array (a list of all places/providers to search)
• The ID should be used uniquely to identify the provider and not specify where to search from

Also using the app id is not a good choice as one app can have multiple providers registered (e.g. dav has Contacts, Events and Tasks search)

cc: @Altahrim