feat: add timestamps parameter

[fahimahmedx]

Motivation

Be able to filter for data by using a timestamp parameter. Initially this will be a unix timestamp.
Example usage:
cryo logs --timestamps 1700080000:1700090000

Solution

• Add timestamp to args.rs
• Create timestamp_to_block_number() function that gives the nearest block number for a given timestamp.
• Add parse_timestamp() and related functions that parse an inputted timestamp.
• Change timestamp_to_block_number() to be strictly <= instead of closest block or <= if two blocks are equidistant.
• Refactor get_latest_block_number() into blocks.rs
• Add tests
• Add documentation

[sslivkoff]

looking great. thanks for taking this on

[sslivkoff]

some important edge cases to check:

• a timestamp less than genesis timestamp
• a timestamp equal to genesis timestamp
• a timestamp greater than latest block timestamp
• a timestamp equal to latest block timestamp

[sslivkoff]

the formatting error gets fixed with cargo +nightly fmt --all

[sslivkoff]

nice job. this is looking really good and it will be a very useful feature. I like that you implemented the full parsing grammar in the block style syntax

I think it's ready to merge after the 2 small points I highlighted