Change method signature of `expr_as` to accept `self` #1979 #3897

Job	Run time
Rustfmt	15s
Init	3s
Examples Matrix	2s
Clippy	1m 20s
Unit Test	3m 22s
Compile MySQL (actix, native-tls)	3m 3s
Compile SQLite (async-std, native-tls)	3m 7s
Compile PostgreSQL (tokio, native-tls)	3m 20s
Compile MySQL (actix, rustls)	3m 8s
CLI	0s
Compile SQLite (async-std, rustls)	3m 14s
Compile PostgreSQL (tokio, rustls)	3m 18s
Issues Matrix	0s
Examples (examples/basic)	1m 15s
Examples (examples/axum_example)	2m 30s
Examples (examples/actix_example)	2m 33s
Examples (examples/jsonrpsee_example)	2m 43s
Examples (examples/actix3_example)	2m 40s
Examples (examples/tonic_example)	2m 32s
Examples (examples/graphql_example)	2m 47s
Examples (examples/rocket_example)	3m 18s
Examples (examples/seaography_example)	2m 38s
Examples (examples/salvo_example)	2m 47s
Examples (examples/poem_example)	2m 28s
Issues	0s
MySQL (8, actix, native-tls)	4m 10s
MySQL (5.7, actix, native-tls)	3m 51s
MariaDB (10.6, actix, native-tls)	2m 27s
SQLite (async-std, native-tls)	2m 52s
SQLite (async-std, rustls)	3m 15s
Postgres (14.4, tokio, native-tls)	6m 59s
	1h 15m 57s

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