Add AsyncIO HTTP compression test

[kthui]

Verifies the Python AsyncIO HTTP client can handle data compression, plus some refactoring.

Original request and response compression algorithms:

request	response	request != response	is original test case
-	-	❌	❌
-	deflate	✅	✅
deflate	-	✅	✅
deflate	deflate	❌	❌
-	gzip	✅	✅
gzip	-	✅	✅
gzip	gzip	❌	❌
deflate	gzip	✅	✅
gzip	deflate	✅	✅

closes: #6887

[fpetrini15]

Really great work condensing the tests Jacky; it's much cleaner now! Also the table in the description was very slick 🚀.

Just one minor, optional comment.

[rmccorm4]

Nice cleanup Jacky! 🚀

Also big fan of the table in the description to summarize the changes!

[fpetrini15]

LGTM, great work!