Feature/#684 external autoclaim service (#686)

* main, config, initial autoclaim

* blockchain manager

* Autoclaim working

* MaxNumberOfClaimsPerGroup and readme

* linter

autoclaimservice/README.md

@@ -0,0 +1,41 @@
+# AutoClaim service
+This service allows to claim deposits whose destination is the network specified by the bridgeAddress and RPC network.
+
+## Configuration file:
+This is an example of the configuration file.
+```
+[Log]
+Level = "debug"
+Outputs = ["stdout"]
+
+[AutoClaim]
+AuthorizedClaimMessageAddresses = []
+AutoClaimInterval = "10m"
+MaxNumberOfClaimsPerGroup = 10
+BridgeURL = "http://localhost:8080"
+
+[BlockchainManager]
+PrivateKey = {Path = "./test.keystore.autoclaim", Password = "testonly"}
+L2RPC = "http://localhost:8123"
+PolygonBridgeAddress = "0xFe12ABaa190Ef0c8638Ee0ba9F828BF41368Ca0E"
+ClaimCompressorAddress = "0x2279B7A0a67DB372996a5FaB50D91eAA73d2eBe6"
+```
+- The log seccion allows to modify the log level. By default: debug mode
+- The autoclaim seccion allows to configure the next parameters:
+  - `AuthorizedClaimMessageAddresses` These are the addresses that can use the autoclaim feature for bridge messages. By default: none
+  - `AutoClaimInterval` This is the param that controls the interval to check new bridges. By default: 10m
+  - `MaxNumberOfClaimsPerGroup` This param allow to control the maximum numbre of claims that can be grouped in a single tx. By default: 10
+  - `BridgeURL` This is the bridge service URL to get the bridges that can be claimed. By default: localhost:8080
+- The BlockchainManager seccion allows to modify network parameters.
+  - `PrivateKey` is the wallet used to send the claim txs. By default: 0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266
+  - `L2RPC` is the URL of the L2 node to send claim txs. By default: localhost:8123
+  - `PolygonBridgeAddress` is the L2 bridge address. By default: 0xFe12ABaa190Ef0c8638Ee0ba9F828BF41368Ca0E
+  - `ClaimCompressorAddress` is the compressor smc address. By default: 0x2279B7A0a67DB372996a5FaB50D91eAA73d2eBe6
+
+***Note: If ClaimCompressorAddress is not defined or MaxNumberOfClaimsPerGroup is 0, then the claim compressor feature is disabled and claim txs will be sent one by one.
+
+## How to run:
+This is a command example of how to run this service:
+```
+go run main.go run --cfg ./config/config.local.toml
+```