[Refactor] Move Provider into its own module #2082

Job	Run time
wasm-wasi	2m 10s
test stable --no-default-features	1m 47s
doctest	2m 11s
test stable	2m 19s
clippy	1m 8s
test stable --all-features	2m 15s
feature-checks	4m 43s
fmt	11s
test nightly --no-default-features	1m 24s
no-std	31s
test nightly	1m 26s
wasm-unknown	1m 38s
test nightly --all-features	2m 15s
cfg-check	29s
docs	50s
test 1.76 --no-default-features	1m 22s
test 1.76	1m 10s
	27m 49s

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