refactor(server): remove block time configuration from config and server params

[flavor-town]

Description

The block time configuration was removed from the raw config and server params.
The initBlockTime function was also removed from the server params.
polygon-edge server command was not doing anything with those values.

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have updated the official documentation
• I have added sufficient documentation in code

Testing

• I have tested this code with the official test suite
• I have tested this code manually

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[flavor-town]

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[Stefan-Ethernal]

Generally the problem we are currently facing is that server config (https://github.com/flavor-town/polygon-edge/blob/EVM-571/server/config.go#L27), that is used for providing syncer block time remains 0 with this change. Therefore we need to figure out a way to fetch block time from consensus parameters.

PolyBFTConfig already has such field, however not sure for IBFT.