sds: Implement insert and lookup operations for BloomFilter

[adklempner]

1. Implement insert method in BloomFilter that:

   • Accepts string or Uint8Array input
   • Generates k hash values for the input
   • Sets corresponding bits in the backing array
   • Handles bit array bounds correctly
   • Is efficient for repeated insertions

2. Implement lookup method in BloomFilter that:

   • Accepts string or Uint8Array input
   • Generates same k hash values as insert
   • Checks all corresponding bits in backing array
   • Returns false if any required bit is not set
   • Returns true if all required bits are set

The implementation should match the behavior of the nim-sds reference implementation.