Make accessors for all config values #2455

Job	Run time
Lint	18s
Docs	1m 31s
Test	42s
build_versions (stable)	17s
Test (charset)	44s
Test	38s
build_versions (beta)	18s
cargo-deny (aarch64-apple-ios)	22s
Test (cookies)	45s
Test (charset)	41s
build_versions (1.71.1)	30s
cargo-deny (aarch64-linux-android)	19s
Test (cookies)	34s
Test (socks-proxy)	45s
cargo-deny (i686-pc-windows-gnu)	19s
Test (socks-proxy)	34s
Test (gzip)	51s
cargo-deny (i686-pc-windows-msvc)	21s
Test (gzip)	32s
cargo-deny (i686-unknown-linux-gnu)	19s
Test (brotli)	1m 5s
Test (brotli)	38s
cargo-deny (wasm32-unknown-unknown)	22s
Test (json)	47s
Test (native-tls)	52s
cargo-deny (x86_64-apple-darwin)	22s
Test (json)	35s
Test (native-tls)	49s
cargo-deny (x86_64-apple-ios)	19s
cargo-deny (x86_64-pc-windows-gnu)	22s
cargo-deny (x86_64-pc-windows-msvc)	19s
cargo-deny (x86_64-unknown-linux-gnu)	20s
cargo-deny (x86_64-unknown-redox)	19s
	18m 29s

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