Chores/smart contracts interaction fixes

[quetool]

Description

• Added Connectivity check to core and throw exceptions when internet connection is gone
• Fix for https://github.com/WalletConnect/WalletConnectFlutterV2/issues/303 (EIP-55 validation for SIWE)
• Minor improvements

How Has This Been Tested?

Due Dilligence

• [ ] Breaking change
• [ ] Requires a documentation update

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarCloud