refactor(client)!: use `bitreq` for both `BlockingClient` and `AsyncClient` #655

Job	Run time
Rust Clippy	53s
Rust Formatting	16s
Build & Test (stable, default)	20s
Build & Test (stable, blocking)	20s
Build & Test (stable, blocking-https-bundled)	6s
Build & Test (stable, blocking-https)	19s
Build & Test (stable, async-https)	21s
Build & Test (stable, blocking-https-native)	1s
Build & Test (stable, blocking-https-rustls)	20s
Build & Test (1.63.0, blocking)	11s
Build & Test (stable, async-https-rustls-manual-roots)	20s
Build & Test (stable, async)	20s
Build & Test (stable, async-https-native)	22s
Build & Test (stable, async-https-rustls)	8s
Build & Test (1.63.0, blocking-https)	11s
Build & Test (1.63.0, blocking-https-native)	1s
Build & Test (1.63.0, async-https-rustls-manual-roots)	12s
Build & Test (1.63.0, async)	12s
Build & Test (1.63.0, default)	14s
Build & Test (1.63.0, async-https)	11s
Build & Test (1.63.0, blocking-https-rustls)	10s
Build & Test (1.63.0, async-https-native)	14s
Build & Test (1.63.0, async-https-rustls)	14s
Build & Test (1.63.0, blocking-https-bundled)	1s
	5m 57s

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