Add Chains retrieval and cache deletion debug logs

[hectorgomezv]

Summary

This PR adds optional logs to the retrieval/cache deletion of Chain objects from the Safe Config Service.

Changes

• Adds a feature flag to control Chain-related debugging logs: configHooksDebugLogs.
• Adds optional logging to ConfigApi when the clearChain function is executed (after the reception of a CHAIN_UPDATED event).
• Adds optional logging to CacheFirstDatasource when the chain/chains cache key is written in the cache.

[coveralls]

Pull Request Test Coverage Report for Build 10080178428

Details

• 7 of 11 (63.64%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.003%) to 48.457%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/datasources/cache/cache.first.data.source.ts	2	4	50.0%
src/datasources/config-api/config-api.service.ts	5	7	71.43%

Totals
Change from base Build 10054294132:	0.003%
Covered Lines:	4332
Relevant Lines:	7207

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💛 - Coveralls