* refactor APIs in JMAP and Groupware in order to implement pagination
across multiple accountIds and multiple suppliers (currently
implemented using a mock supplier for contacts)
* requires go 1.26 due to use of self-reflecting generics type
constraints
* still missing: query criteria and sorting parameters
* still missing: multi-accountId support for emails
* errors are now all just 'error' in the APIs, instead of the
specialized implementations, and are interpreted dynamically where
necessary in order to transform them into HTTP responses
* remove position, anchor, anchorOffset as individual query parameters
as we now only support a 'next=...' token for subsequent pages
(except in emails for now), and use jmap.QueryParams instead; those
tokens have a header character for the format, followed by a JSON
encoded QueryParams map, all wrapped into base62 to make it clearer
that it is meant to be an opaque token, and not a parameter clients
should tinker with or construct themselves
* introduce QueryParamsSupplier as an interface to provide QueryParams
for various scenarios (single supplier, multiple supplier, ...) per
accountId
* implement multi-supplier template methods slist and squery
* in the JMAP API as well as in several places in the Groupware
framework, use a single jmap.Response[T] object to return the
payload, the language, the session state and the etag/state instead
of individual multi-valued return values
* adds creating addressbooks, calendars, mailboxes
* adds deleting mailbox, event, identity
* adds modifying an email
* introduce template functions for the Groupware API in templates.go,
and use those in route function implementations whenever possible
* add capability checking for mail, quota, blobs
* adds Changes interface
* adds JmapResponse interface
* make the JMAP internal API a bit more future-proof by passing
ObjectType objects instead of the JMAP namespaces
* remove the new attempt to contain operations even further using the
Factory objects
* move CalendarEvent operations to its own file, like everything else
* fix email tests
* ignore WS error when closing an already closed connection
* move ContactCard from jscontact to jmap, as it is actually a JMAP
specification item, but also was causing too many issues with
circular references from jscontact -> jmap
* introduce Foo, Idable, GetRequest, GetResponse, etc... types and
generics
* first attempt at a Foo factory type for Mailboxes, needs to be
expanded to further minimize repetition
* add more specialized template functions to avoid repetition
* introduce ChangesTemplate[T] for *Changes structs
* add Groupware APIs for creating and deleting addressbooks
* add Groupware APIs for creating and deleting calendars
* add JMAP APIs for creating and deleting addressbooks, calendars
* add JMAP APIs to retrieve Principals
* fix API tagging
* move addressbook JMAP APIs into its own file
* move addressbook Groupware APIs into its own file
