Use better Go types for CQL decimal and uuid

[adutra]

As a follow-up to #29 we could ask ourselves if we should replace the following built-in types with alternatives provided by other libraries:

• Arbitrary-precision floating point types (CQL decimal)
  • Note that big.Float is not adapted for CQL decimal;
  • The best package seems to be https://pkg.go.dev/github.com/ericlagergren/decimal/v3;
  • Other alternatives:
    • https://pkg.go.dev/github.com/cockroachdb/apd/v2
    • https://pkg.go.dev/gopkg.in/inf.v0
  • Good read: https://stackoverflow.com/questions/34487648/go-monetary-calculations/34490512
• UUID: https://pkg.go.dev/github.com/google/uuid
• For CQL duration, we'll address it in Add support for CQL duration #34 .