chore: forward features to `imap-codec`

[duesee]

This won't work until I is merged and imap-codec 2.0.0-alpha.4 is published. This is how it would look like. I made this PR so that we can discuss.

Closes #257.

[coveralls]

Pull Request Test Coverage Report for Build 10065174100

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 83.157%

---

Totals
Change from base Build 10063894153:	0.0%
Covered Lines:	1022
Relevant Lines:	1229

---

💛 - Coveralls