feat: user apps (#1173)

Co-authored-by: onerandomusername <[email protected]>

changelog/1173.deprecate.0.rst

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+Deprecate :attr:`ApplicationCommand.dm_permission` and related fields/parameters of application command objects. Use ``contexts`` instead.

changelog/1173.deprecate.1.rst

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+Deprecate :attr:`Message.interaction` attribute and :class:`InteractionReference`. Use :attr:`Message.interaction_metadata` instead.

changelog/1173.feature.rst

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+Add support for user-installed commands. See :ref:`app_command_contexts` for further details.
+- Add :attr:`ApplicationCommand.install_types` and :attr:`ApplicationCommand.contexts` fields,
+  with respective :class:`ApplicationInstallTypes` and :class:`InteractionContextTypes` flag types.
+- :class:`Interaction` changes:
+    - Add :attr:`Interaction.context` field, reflecting the context in which the interaction occurred.
+    - Add :attr:`Interaction.authorizing_integration_owners` field and :class:`AuthorizingIntegrationOwners` class, containing details about the application installation.
+    - :attr:`Interaction.app_permissions` is now always provided by Discord.
+- Add :attr:`Message.interaction_metadata` and :class:`InteractionMetadata` type, containing metadata for the interaction associated with a message.
+- Add ``integration_type`` parameter to :func:`utils.oauth_url`.
+- Add :attr:`AppInfo.guild_install_type_config` and :attr:`AppInfo.user_install_type_config` fields.
+- |commands| Add ``install_types`` and ``contexts`` parameters to application command decorators.
+- |commands| Add :func:`~ext.commands.install_types` and :func:`~ext.commands.contexts` decorators.
+- |commands| Using the :class:`GuildCommandInteraction` annotation now sets :attr:`~ApplicationCommand.install_types` and :attr:`~ApplicationCommand.contexts`, instead of :attr:`~ApplicationCommand.dm_permission`.