Update relayer endpoints

[salman01zp]

Summary of changes

• Leaf Caching API
  Leaf caching API will be sending cached leaf as HexString instead of bytes.

     /api/v1/leaves/evm/:chain_id/:contract_address
  

  Response

       {
           "leaves": [
               "0x2f286532136e3110a63779df0cac44543d10d94e54f651e86eaff7851a631e45",
               "0x20f9563640ed1d21151a60823212499497ef6b3c0d2a6593d6a2a9748fc1db98",
               "0x283376a2134ac8096e523c74573dc84eec9c308ee9f831595b25b1ecb01f78a0",
               "0x1c22842f1b1b731d5a3d9f3b0fe7de1ba7f1ede9eadc3b699121363edd337108",
               "0x0aebac8baafcba5873723eb58b947c9c5f523a28c1c5872a613febc9942b0821",
               "0x2268d2119c2d5de58cd5367a54549b07decc9d299f1e9b1810c0926977c915f4",
               "0x194e2540861267b9a3d31660e242fc40774c9a72c32b7f67a7fcd4dc9193102e",
               "0x0784707003bd770b2a57f02434c4fa5035f5777f57750d6c91fccf384418ef5e",
               "0x1962dda78713ae31c2d5b7ec727c10ff61acc918e7c76e570bc25d9b73e58f22",
               "0x0d9ad8106a87ea871b8bc1620388fa35a95a0201f9b94746e87d10f9b0f53d6b"
             ],
  
      }

---

• Fee Info API
  Since we made separate API into evm and substrate, we don't need to send TypedChainIds anymore but instead, need to send underlying chain id. eg 5001, 5002
  EVM

      /api/v1/fee_info/evm/:chain_id/:vanchor/:gas_amount
  

  Substrate

     /api/v1/fee_info/substrate/:chain_id/:partialFee
  

---

• Relayer Info API
  Adding build info configuration here, so we can get build-related details like build version, branch, commit hash, build time.

    /api/v1/info
  

  Response

      {
         "evm": {
             "rinkeby": {
                 "enabled": true,
                 "chainId": 4,
                 "beneficiary": "0x58fcd47ece3ed24ace88fee06efd90dcb38f541f",
                 "contracts": [{
                     "contract": "Anchor",
                     "address": "0x9d36b94f245857ec7280415140800dde7642addb",
                     "deployedAt": 8896800,
                     "eventsWatcher": {
                         "enabled": true,
                         "pollingInterval": 15000
                     },
                     "size": 0.1,
                     "proposalSigningBackend": { "type": "DKGNode", "node": "dkg-local" },
                     "withdrawFeePercentage": 0.05
                 }]
             }
         },
         "substrate": {},
         "experimental": {
             "smart-anchor-updates": false,
             "smart-anchor-updates-retries": 0
         },
         "features": { "dataQuery": true, "governanceRelay": true, "privateTxRelay": true },
         "assets": {
             "TNT": { "price": 0.1, "name": "Tangle Network Token", "decimals": 18 },
             "tTNT": { "price": 0.1, "name": "Test Tangle Network Token", "decimals": 18 }
         },
         "build" : {
             "version": "0.5.0",
             "commit": "c8875ba78298d34272e40c2e302fcfe33f191147",
             "build_time": "2023-05-19T15:57:40Z"
         }
     }

Note For Dapp Team

Since this will be breaking changes, you will need to make appropriate changes in DAPP.
CC: @AtelyPham

Reference issue to close (if applicable)

• Closes [TASK] Return Cached Leaves as different format instead of Arrays #508
• Closes [TASK] Remove the need for TypedChainIds in the API Endpoints #510
• Closes [TASK] Embed Relayer version, git commit/rev into relayer binary for /api/v1/info #512

---

Code Checklist

• Tested
• Documented

[shekohex]

Looks good! I left a few comments. Please address these changes and update the docs.

[shekohex]

Also lets from now on update our version in the following https://semver.org/
https://github.com/webb-tools/relayer/blob/c8875ba78298d34272e40c2e302fcfe33f191147/services/webb-relayer/Cargo.toml#L3

Examples:

• For develop branch, we must always use the term dev at the end of the version.

0.5.19-dev

• when creating a new pre-release, we remove the dev part and start using rc.X part where we increment the X each time:

0.5.19-rc.25

• When we create a stable release, or while we are going to push to a main branch, we take the last rc.X and use it as stable:

0.5.19

[shekohex]

One more thing and we good to go.

[shekohex]

LGTM!