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feat(decint)!: correct the safe range to the float64-exact 2^33 boundary, add sentinel errors, and format strings exactly from integers

- Fix the safe-range constants: MaxFloat is now 2^33 (8_589_934_592) and MaxInt is 2^33*1e6, the largest magnitude at which a float64 still resolves a 1e-6 step; the previous 2^53-derived range overstated what float64 can hold and silently dropped the sixth decimal digit above ~8.59e9 on both the parse and format paths.
- Add exported sentinel errors ErrInvalidNumber and ErrOutOfRange, wrapped by StringToInt and StringToUint so callers can distinguish unparseable or non-finite input from out-of-range values while keeping the underlying strconv error in the chain.
- Format IntToString and UintToString directly from the scaled integer, so output is exact for every value (including out-of-range inputs) and no longer depends on float64 precision.
- Document the StringToUint rule (non-finite input errors, finite non-positive clamps to zero, above-max errors) and align the FloatToUint rounding wording with FloatToInt.
- Add benchmarks for all conversions and regression tests pinning the corrected boundary, exact round-trips near the maximum, and half-away-from-zero rounding.

BREAKING CHANGE: MaxInt and MaxFloat change value (the safe range shrinks from ~2^53/1e6 to 2^33), and StringToInt/StringToUint now return errors wrapping ErrInvalidNumber or ErrOutOfRange instead of bare formatted strings.

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