Add `get_address_stats` and `get_address_txns` endpoints #541

Job	Run time
Rust Formatting	14s
Rust Clippy	4m 20s
Build & Test (stable, default)	3m 54s
Build & Test (stable, blocking)	3m 15s
Build & Test (stable, blocking-https)	3m 22s
Build & Test (stable, blocking-https-rustls)	3m 25s
Build & Test (stable, blocking-https-native)	3m 16s
Build & Test (stable, blocking-https-bundled)	5m 32s
Build & Test (stable, async)	3m 46s
Build & Test (stable, async-https)	3m 39s
Build & Test (stable, async-https-native)	3m 40s
Build & Test (stable, async-https-rustls)	3m 47s
Build & Test (stable, async-https-rustls-manual-roots)	3m 50s
Build & Test (1.63.0, default)	6m 5s
Build & Test (1.63.0, blocking)	5m 33s
Build & Test (1.63.0, blocking-https)	5m 40s
Build & Test (1.63.0, blocking-https-rustls)	5m 35s
Build & Test (1.63.0, blocking-https-native)	5m 25s
Build & Test (1.63.0, blocking-https-bundled)	7m 43s
Build & Test (1.63.0, async)	5m 53s
Build & Test (1.63.0, async-https)	5m 47s
Build & Test (1.63.0, async-https-native)	6m 3s
Build & Test (1.63.0, async-https-rustls)	5m 57s
Build & Test (1.63.0, async-https-rustls-manual-roots)	6m 3s
	1h 51m 44s

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