Make accessors for all config values #2459

Job	Run time
Test	47s
Test	29s
Test (charset)	45s
build_versions (stable)	12s
Test (charset)	31s
Test (cookies)	47s
build_versions (beta)	17s
Test (cookies)	34s
Test (socks-proxy)	48s
build_versions (1.71.1)	15s
Test (socks-proxy)	38s
Test (gzip)	44s
Test (gzip)	30s
Test (brotli)	48s
Test (brotli)	31s
Test (json)	49s
cargo-deny (aarch64-apple-ios)	21s
Test (json)	31s
Test (native-tls)	51s
cargo-deny (aarch64-linux-android)	21s
Test (native-tls)	39s
cargo-deny (i686-pc-windows-gnu)	20s
cargo-deny (i686-pc-windows-msvc)	21s
Docs	1m 31s
cargo-deny (i686-unknown-linux-gnu)	18s
Lint	29s
cargo-deny (wasm32-unknown-unknown)	20s
cargo-deny (x86_64-apple-darwin)	19s
cargo-deny (x86_64-apple-ios)	19s
cargo-deny (x86_64-pc-windows-gnu)	20s
cargo-deny (x86_64-pc-windows-msvc)	18s
cargo-deny (x86_64-unknown-linux-gnu)	20s
cargo-deny (x86_64-unknown-redox)	21s
	17m 24s

Provide feedback