[C++][Gandiva] Add rand_integer function

[dmitry-chirkov-dremio]

Describe the enhancement requested

Add rand_integer function to Gandiva to generate random integers, complementing the existing rand/random functions that generate random doubles.

Proposed signatures:

1. rand_integer() → int32 - Returns random integer in full int32 range [INT32_MIN, INT32_MAX]
2. rand_integer(int32 range) → int32 - Returns random integer in range [0, range-1]
3. rand_integer(int32 min, int32 max) → int32 - Returns random integer in range [min, max] inclusive

Implementation approach:

• Follow the existing RandomGeneratorHolder pattern
• Use std::uniform_int_distribution<int32_t> for integer generation
• Validate parameters at expression compilation time (range > 0, min <= max)
• Use Mersenne Twister (std::mt19937_64) as the random engine

Rationale:

This function provides native integer random number generation, matching common patterns in other systems and programming languages (e.g., Java's Random.nextInt()), and offers a more efficient alternative to CAST(rand() * range AS INT) for generating random integers.

Component(s)

C++, Gandiva

[dmitry-chirkov-dremio]

take