Precomputed block writer with updateable settings

[Isaac-DeFrain]

Explain your changes:

• add fully adjustable precomputed block writer
• add client commands and RPCs to change settings
• add --precomputed-blocks-dir cli flag
• improve logging wrt precomputed block writing

New client commands

set-block-dir             Set precomputed block dump directory
set-block-file            Set precomputed block dump file for replaying
set-block-logging         Set precomputed block logging
deactivate-block-dir      Stop dumping precomputed blocks
deactivate-block-file     Stop appending precomputed blocks to replay file
deactivate-block-logging  Stop logging precomputed blocks

Explain how you tested your changes:

The cli was built and connected to the berkeley rampup network. Each command was manually tested to verify functionality.

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[Isaac-DeFrain]

!ci-build-me

[Isaac-DeFrain]

!ci-build-me

[Isaac-DeFrain]

!ci-build-me

[mitschabaude]

!ci-build-me