Integrate rust verifier micro-service

[nikitosing]

Close #5574
Close #5886

Changelog

• add multi-part files verification
• move verification logic to rust micro-service
• add 2 ENV variables to manage integration:

export ENABLE_RUST_VERIFICATION_SERVICE=true
export RUST_VERIFICATION_SERVICE_URL=http://0.0.0.0:8043/

Checklist for your Pull Request (PR)

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so by submitting a PR to https://github.com/blockscout/docs
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/blockscout/docs to update the list of env vars at https://github.com/blockscout/docs/blob/master/for-developers/information-and-settings/env-variables.md and I updated the version to master in the Version column. Changes will be reflected in this table: https://docs.blockscout.com/for-developers/information-and-settings/env-variables.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools

[vbaranov]

@nikitosing I've launched Rust microservice locally, set env variables in order to enable microservice integration in Blockscout:

export ENABLE_RUST_VERIFICATION_SERVICE=true
export RUST_VERIFICATION_SERVICE_URL=http://0.0.0.0:8043/

And the list of compiler versions is empty (I tested flattened source code verification):

Whereas corresponding microservice endpoint works fine:

[vbaranov]

@nikitosing let's define env variables in runtime config instead of regular config in order to change them without recompiling?

[vbaranov]

@nikitosing when chosing multi-part verification, /verify-via-flattened-code/new path is opened. I suppose, this is the bug?

Fixed by running mix phx.digest