ci: add wasm OpenSSL dependency for httpfs

[adsharma]

Summary

Adds a pinned prebuilt OpenSSL dependency for the wasm package build and wires it into the static httpfs build path.

Current status

This is intentionally a draft PR. The branch preserves the work so we can continue later, but CI is not green yet.

The latest CI attempt confirms that CMake can now find OpenSSL for the wasm target:

-- Found OpenSSL: .../lib/libcrypto.a

The remaining blocker is that the current prebuilt jedisct1/openssl-wasm artifact is configured with OPENSSL_NO_SOCK, so cpp-httplib fails when CPPHTTPLIB_OPENSSL_SUPPORT tries to use BIO_new_socket.

Validation

• git diff --check
• GitHub Actions wasm workflow was run against this branch and currently fails at the BIO_new_socket compile issue described above.