Souper-CROW improvements

The communication between Souper and CROW can be improved.

DONE in #67:
- Souper
- [x] Parallel processing of code blocks
- [x] Peer2Peer socket communication with CROW if a replacement is found.
- [x] Remove the Redis middle bridge to collect the replacements

- CROW
- [x] Peer2Peer socket communication with Souper to collect the replacements on the fly (as soon as it is found)

TODO:
- [ ] Merge the Exploration and Generation stages. Start the generation as soon as replacements are found.
- [ ] Prevent overlapping
- [ ] Modify Souper to avoid non-valid WASM instruction during the synthesis
- [ ] Sanitize replacements
- [ ] Extra validation stage

Start by reviewing the communication work marked done in #67, then locate Souper's Exploration and Generation stages and the replacement handling in CROW. The issue names no files or tests; done would require agreeing on and implementing the listed stage merging, overlap prevention, WASM validation, sanitization, and extra validation work.

Written by the indexing model from the issue text.