chore: Use @rocket.chat/message-parser instead of Commonmark

[OtavioStasiak]

Proposed changes

Remove the deprecated markdown and sets our messageParser and the new markdown as the default.

Issue(s)

https://rocketchat.atlassian.net/browse/NATIVE-103

How to test or reproduce

• Open the app;
• Go to room;
• Send a message;

Screenshots

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves a current function)
• New feature (non-breaking change which adds functionality)
• Documentation update (if none of the other choices apply)

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• I have added necessary documentation (if applicable)
• Any dependent changes have been merged and published in downstream modules

Further comments

[diegolmello]

We can't inject Storybook inside production code like this.
getCustomEmoji is already a prop, so can't we just send getStorybookCustomEmoji as prop to Avatar?

BTW I think we should do this change in a separate PR.
This one is big already and the storybook changes should be done separately, because it's an important change and it gets proper visibility.