chore: fix move of repository

[gregorydemay]

The library canhttp that was initially in the EVM RPC canister repository was moved as is from commit 3995dbd to this repository as commit d41568a while preserving the Git history (using git filter-repo --subdirectory-filter canhttp as described here). Additionally, the Git history was rewritten to preserve the links to the original PRs with

git filter-repo --message-callback 'return re.sub(br"#(\d{3})", br"dfinity/evm-rpc-canister#\1", message)'

so that commit messages like this one that were pointed to PRs such as #364 are now pointing to dfinity/evm-rpc-canister#364.

This broke various things that this PR addresses:

1. Symlinks for license and notice that were pointing to files outside the moved crate.
2. Re-create a Cargo workspace.
3. Add Github CI pipeline.