Make execution constants configurable

[eshaan7]

          64 is probably fine for now. Maybe would want to make this configurable though in the future.

Originally posted by @ncitron in #535 (comment)

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The constants defined in file core/src/execution/constants.rs such as:

• MAX_STATE_HISTORY_LENGTH
• MAX_SUPPORTED_BLOCKS_TO_PROVE_FOR_LOGS
• PARALLEL_QUERY_BATCH_SIZE

should all be configurable by the end user.

[eshaan7]

Related: #538 (comment)

[eshaan7]

Also applies to PARALLEL_QUERY_BATCH_SIZE (see #505 (comment)).

[sidx04]

hi @eshaan7 , im willing to take this up! any specifics of implementation you want me to keep in mind? what i had in mind was passing in an option with the cli itself as mentioned here in #505 with a default value if not passed in initially