feat: Prevent missconfiguration of bridgeAddress in bridgesyncer

[joanestebanr]

Description

• A common mistake is to set the variable polygonBridgeAddr inside the section [L1Config] in config file. This is prevented with the list of deprecated variables on config file
• Another possible error is to set the wrong address. To fix that the code checks that the contract is the bridge one testing a method.

Fixes #167

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
93.8% Coverage on New Code
0.0% Duplication on New Code

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