Chore/review deploy

[kfastov]

Ran through entire deploy script, sorting out the blockers and fixing the following alongside:

1. Move contract address saving feature from Solidity to JS
2. Simplify variable names (ethereumEtherscanApiKey -> etherScanApiKey and so on)
3. Add a getter for the verifier URL (for Linea)
4. Fix minor bug in parsing output of Forge scripts (entire data was used inside a loop instead of the loop variable)
5. Cleaner and more informative messages in deploy script (e.g. show contract addresses, summary of each stage)
6. Create environment files for network-dependent configuration like addresses of important contracts (used separate json configs for that before, now removed)
   Problems that I couldn't fix yet:
7. Deploy script in the reference repo has much more functionality (mainnet, devnet deployment). This one was currently only tested on Sepolia.
8. Contract verification failed because of Etherscan was unabled to compile the sources on their side (probably need to simplify our import paths):

% forge verify-contract 0x4f71bB382A119d0545C28FB532Cad673aF321C9F src/LineaWorldID.sol:LineaWorldID --etherscan-api-key <CENSORED> --verifier-url https://api-sepolia.lineascan.build/api --watch
Start verifying contract `0x4f71bB382A119d0545C28FB532Cad673aF321C9F` deployed on sepolia

Submitting verification for [src/LineaWorldID.sol:LineaWorldID] 0x4f71bB382A119d0545C28FB532Cad673aF321C9F.
Submitted contract for verification:
        Response: `OK`
        GUID: `bgjrh92uephaqvbtcsbiwfckrz9dci3gmkbgfdqyznm9zdk41h`
        URL: https://sepolia.etherscan.io/address/0x4f71bb382a119d0545c28fb532cad673af321c9f
Contract verification status:
Response: `NOTOK`
Details: `Pending in queue`
Contract verification status:
Response: `NOTOK`
Details: `Fail - Unable to verify. Solidity Compilation Error: Source "src/interfaces/ISemaphoreVerifier.sol" not found: File not found. Searched the following locations: "".`
Error: 
Checking verification result failed

Context:
- Contract failed to verify.

Current deployments:

✔ LineaWorldID already deployed at 0x5d676D93ffE4dC07805a780531a559b08cC3564d
✔ LineaStateBridge already deployed at 0x64A96eED1dA15FCFb0874D82F7D7C6ea3Fda6aEf