feat(p/uint256): Add overflow check and fullmath calculation functions

[notJoon]

Description

• Added the isOverflow function to checks if a number exceeds the 256-bit uint range limit by verifying if the 256th bit is set.
• FullMath Calculation Functions
  • added full-precision math operations, including MulDiv, MulDivRoundingUp, and DivRoundingUp
  • These functions implement a 512×256-bit division algorithm
• Updated docs for bits_table
• Changed to use uassert package in test codes

[Gno2D2]

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[thehowl]

Can you provide some context, especially on the fullmath functions?

[jefft0]

Can you provide some context, especially on the fullmath functions?

@notJoon , do you have a reply to this question?

[Kouteki]

Message from @notJoon

This is a PR updated to synchronize with the version being used in gnoswap. The purpose was to remove the package being used on our side once this is merged, but I forgot to add an description.