bernardladenthin / BitcoinAddressFinder / #316

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Add loopCount support to OpenCL kernel for batched key generation

- Introduced `loopCount` parameter in `CProducerOpenCL` to allow multiple key computations per OpenCL work-item.
- Documented `loopCount` usage and constraints in detail.
- Adjusted `OpenClTask` to divide total work size by `loopCount`, validating input constraints.
- Updated kernel signature `generateKeysKernel_grid` to accept `loopCount` as third argument.
- Refactored kernel logic to loop over `loopCount` iterations:
  - First iteration uses `point_mul_xy` for scalar multiplication.
  - Subsequent iterations use `point_add_xy` to accumulate additional keys.
  - Coordinates are serialized and hashed per loop iteration.
- Added helper `copy_constant_u32_array_private_u32()` to copy constants into local registers.
- Defined precomputed base point offsets (`G_OFFSET_X1`, etc.) using `ONE_COORDINATE_NUM_WORDS` for clarity and maintainability.
- Updated test classes to set `loopCount` derived from `BITS_FOR_BATCH >> 1`.

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