Detect Safe contract addresses using configured RPC

[Uxio0]

• When using the safe_creator use L2 Safe version always unless the network is mainnet
• Allow L2 Safes updating (previously only not L2 Safes were supported)

[coveralls]

Pull Request Test Coverage Report for Build 4263007063

• 15 of 37 (40.54%) changed or added relevant lines in 3 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.3%) to 52.349%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
safe_cli/safe_creator.py	0	4	0.0%
safe_cli/operators/safe_operator.py	6	14	42.86%
safe_cli/safe_addresses.py	9	19	47.37%

Files with Coverage Reduction	New Missed Lines	%
safe_cli/operators/safe_operator.py	2	72.73%
safe_cli/safe_creator.py	2	0%

Totals
Change from base Build 4253101849:	-0.3%
Covered Lines:	713
Relevant Lines:	1362

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💛 - Coveralls