fix: configure rustls & openssl via feature flag

[gakonst]

Some downstream foundry users (foundry-rs/foundry#229) are experiencing issues installing on different platforms. I suspect it MIGHT be related to the openssl dependency which was being pulled in by reqwest.

We can maybe resolve it by feature gating reqwest's SSL provider everywhere, and importing ethers with the reqwest/rustls backend.

Depends on alloy-rs/svm-rs#11

Also, once seanmonstar/reqwest#1396 is released we should bump reqwest to de-duplicate our certs deps

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So this seems to address the issues around

1. openssl being pulled in
2. sha2 being pulled in

Open problems:

• For some reason it triggered WASM to start failing, which is odd given the svm-rs PR above does not change much? Maybe it's the checking-in of the cargo lockfile, in which case it..was already broken? Fixed in 952ac61
• The feature gate-ing of sha2 means that we can no longer run our windows pipelines with --all-features. Is that OK? Might be? Maybe there's a mix between the platform-based configuration that gets us what we need? @mattsse bumped on cargo generate-lockfile doesn't give a working lockfile in some situations rust-lang/cargo#8302 and Platform specific dependencies failing to resolve dependencies with different path rust-lang/cargo#7753 while trying to resolve this, to no success