* add endpoints for Mailboxes:
- PATCH mailboxes/{id}
- DELETE mailboxes/{id}
- POST mailboxes
* refactor the pkg/jmap and groupware framework to systematically
return a jmap.State out-of-band of the per-method payloads, since
they are almost always present in JMAP responses, which lead to the
artificial creation of a lot of composed struct types just to also
return the State; on the downside, it adds yet another return
parameter
* made several email related operations multi-account:
QueryEmailSnippets, QueryEmails, QueryEmailsWithSnippets
* add GetIdentitiesForAllAccounts
* add GetEmailsForAllAccounts
* jmap: add CreateIdentity, UpdateIdentity; groupware: add
GetIdentityById, AddIdentity, ModifyIdentity
* add temporary workaround until Calendars, Tasks, Contacts are
implemented in Stalwart when determining the default account for
those: use the mail one in the mean time
* fix(jmap): fix bug where CommandBlobUpload was used instead of
CommandBlobGet in GetBlob (now GetBlobMetadata)
* we currently don't need a variant of BlobGetCommand that also
retrieves the content of the blob, instead we only use it for
retrieving metadata about it
* the JMAP error handling was not working properly, fixed it and added
error definitions accordingly
* add operations to retrieve mailbox roles and mailboxes by role for
all accounts
* introduce a function 'mcid' to assemble method call IDs per account
instead of doing that inline in each function, in case the rules for
doing so change in the future
* move jmap.request() to jmap.Client.request() and pass the Session
and a Logger to introduce checking the number of methodCalls within a
request not exceeding the limit of the Session, as well as error
handling and logging there instead of in each caller
* a few bugfixes:
- add a few missing Send() calls in logs
- correct the response tag matching for
GetMailboxChangesForMultipleAccounts
- fix typo in Identity.ReplyTo json serialization rune
- fix response tag in pkg/jmap/testdata/mailboxes1.json after
changing them to be prefixed by the accountId
* add URL to retrieve all the mailboxes for all the accounts of a user,
as a first use-case for an all-accounts operation, as
/accounts/all/mailboxes
* add URL to retrieve mailbox changes for all the mailboxes of all the
accounts of a user, as a first use-case for an all-accounts
operation, as /accounts/all/mailboxes/changes
* change the defaultAccountId from '*' to '_', as '*' rather indicates
"all" than "default", and we might want to use that for "all
accounts" operations in the future
* refactor(groupware): remove the accountId parameter from the logger()
function, as it is not used anyways, but also confusing for
operations that support multiple account ids
