Added file_ids handling for incoming messages (#558)

* Added file_ids handling for incoming messages

* Update mattermostautodriver requirement from ~=1.3.0 to ~=2.0.0 (#464)

* Update mattermostautodriver requirement from ~=1.3.0 to ~=2.0.0

Updates the requirements on [mattermostautodriver](https://github.com/embl-bio-it/python-mattermost-autodriver) to permit the latest version.
- [Changelog](https://github.com/embl-bio-it/python-mattermost-autodriver/blob/main/CHANGELOG.rst)
- [Commits](embl-bio-it/python-mattermost-autodriver@1.3.0...2.0.0)

---
updated-dependencies:
- dependency-name: mattermostautodriver
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update requirements.txt

* Update requirements.txt

* Update requirements.txt

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Alex Tzonkov <4975715+attzonko@users.noreply.github.com>

* Added file_ids handling for incoming messages

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: Sergey Dmitrenko <sdmitrenko@ptsecurity.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Alex Tzonkov <4975715+attzonko@users.noreply.github.com>

mmpy_bot/wrappers.py

@@ -38,6 +38,10 @@ def channel_id(self):
     def channel_name(self):
         return self.body["data"]["channel_name"]
 
+    @cached_property
+    def file_ids(self):
+        return self.body["data"]["post"].get("file_ids", [])
+
     @cached_property
     def is_direct_message(self):
         return self.body["data"]["channel_type"] == "D"