feat: Add block tag support in reorgPeriod parameter

[apastushenka]

Description

Allows setting an arbitrary string in reorgPeriod, which is used as a block tag to get the finalized block. Currently, only the Ethereum connector supports this feature with the following tags:

• finalized
• safe
• pending
• latest
• earliest

This is currently useful for EVM-compatible chains that don't have a fixed reorganization period, but instead rely on the block tag Finalized to indicate finality. For such chains, you should set reorgPeriod to finalized instead of a number of blocks.

Drive-by changes

Related issues

Backward compatibility

Yes

Testing

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Latest commit: 9a5640b

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