Add Quota to Connectivity View (#2612)

* add imap::get_quota_roots()

* schedule quote-checking job on getting connectivity-html

* get quota and debug print it

* basic quota output

* update quota at most once per minute, emit event on changes

* use more meaningful names

* add some comments, move update_recent_quota() to quota.rs

* show root name only if there are several roots

* make clippy happy, some refactorings

* allow only one update-quota job per time

* add now supported QUOTA to standards.md

Cargo.toml

@@ -16,7 +16,7 @@ deltachat_derive = { path = "./deltachat_derive" }
 
 ansi_term = { version = "0.12.1", optional = true }
 anyhow = "1.0.42"
-async-imap = "0.5.0"
+async-imap = { git = "https://github.com/async-email/async-imap" }
 async-native-tls = { version = "0.3.3" }
 async-smtp = { git = "https://github.com/async-email/async-smtp", rev="c8800625f7cf29f437143ac7e720ac2730a0962f" }
 async-std-resolver = "0.20.3"
@@ -72,6 +72,7 @@ thiserror = "1.0.26"
 toml = "0.5.6"
 url = "2.2.2"
 uuid = { version = "0.8", features = ["serde", "v4"] }
+humansize = "1.1.1"
 
 [dev-dependencies]
 ansi_term = "0.12.0"