commands: add :query to create named notmuch dirs

The current :cf command can be used to create folders for arbitrary
notmuch queries. These folders use the query as their namee. In some
cases, though, it's useful to give a more human-readable name. Create a
new :query command to allow doing so.

The :query command accepts an optional -n flag to specify a name. The
remaining arguments are interpreted verbatim as a notmuch query. If no
name is specified, the query itself is used as the name.

For example, to create a new folder with the full thread of the current
message, named by its subject, run the following command:

    :query -n "{{.SubjectBase}}" thread:"{mid:{{.MessageId}}}"

:query could have been implemented as an additional flag to :cf. Giving
a name to the created folder would make the smantics of :cf strange,
though. For example, to create a named query folder, one would use
:cf -n <name> <query>. This syntax feels odd; the name of the folder
seems like it ought to be the positional argument of the change folder
command. Alternatively, the usage could be :cf -q <query> <name>, but
this feels wrong as well: the query, which is provided as a positional
parameter when no name is specified, becomes a flag parameter when a
name is specified. What's more, both of these potential usages add a
notmuch-specific flag to an otherwise general command. Creating a new
command feels cleaner. Perhaps the current query functionality of the
:cf command could eventually be deprecated to remove the duplicate
functionality and keep :cf limited to changing to existing folders.

Changelog-added: Create notmuch named queries with the `:query`
 command.
Signed-off-by: Jason Cox <me@jasoncarloscox.com>
Tested-by: Inwit <inwit@sindominio.net>
Acked-by: Robin Jarry <robin@jarry.cc>

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