add block based rarities

[haozhiliu]

Support block based rarities for both individual sat and sat range, including:

• Vintage
• Nakamoto
• First Transaction
• Pizza
• Block 9
• Block 78
• Palindrome (note: iterating sats within a large range is expensive, current implementation is combining accurate counting (if sat range contains less than 1 million sats), and estimation for large range. Given the fact that palindrome becomes very sparse along with sat number increases, even for a huge range, the count of palindrome sat is 0 or 1. Therefore the estimation is not much useful.

[nothing0012]

lgtm, thanks for all the tests. Is it easy to add more types of block rarity?

[destinymagicchen]

nit: in_range since this can be used for any range

[haozhiliu]

lgtm, thanks for all the tests. Is it easy to add more types of block rarity?

Hmm... It would be a case by case implementation depending on the definition of the new "block rarities".