feat: `load("@rules_cuda_redist_json//:redist.bzl", "rules_cuda_components")`

[cloudhan]

#283

cuda_redist_json repo rule download the redistrib.json (redist_json) from the urls, or download from nvidia's default repo if only version is specified. In the repo, we generate a redist.bzl file. The redist.bzl contains macros with wrapped cuda_component repo rules of the components specified in the cuda_redist_json's components attribute.

For example,

cuda_redist_json(
    name = "rules_cuda_redist_json",
    components = [
        "cccl",
        "cudart",
        "nvcc",
    ],
    version = "12.6.3",
)

• Downloads redistrib.json from https://developer.download.nvidia.com/compute/cuda/redist/redistrib_12.6.3.json
• Generates a redist.bzl with the content as follows:

  def rules_cuda_components():
      cuda_component(
          name = "local_cuda_cccl_v12.6.77",
          component_name = "cccl",
          # sha256, strip_prefix and urls automatically filled by reading redist.json
      )
  
      cuda_component(
          name = "local_cuda_cudart_v12.6.77",
          component_name = "cudart",
          # sha256, strip_prefix and urls automatically filled by reading redist.json
      )
  
      cuda_component(
          name = "local_cuda_nvcc_v12.6.85",
          component_name = "nvcc",
          # sha256, strip_prefix and urls automatically filled by reading redist.json
      )
  
      return {"cccl": "@local_cuda_cccl_v12.6.77", "cudart": "@local_cuda_cudart_v12.6.77", "nvcc": "@local_cuda_nvcc_v12.6.85"}
  
  def rules_cuda_components_and_toolchains(register_toolchains = False):
      components_mapping = rules_cuda_components()
      rules_cuda_toolchains(
          components_mapping= components_mapping,
          register_toolchains = register_toolchains,
          version = "12.6.3",
      )
  

User then

load("@rules_cuda_redist_json//:redist.bzl", "rules_cuda_components_and_toolchains")
rules_cuda_components_and_toolchains(register_toolchains = True)

Only WORKSPACE based project is addressed in this PR.