[CK] Add rocm_ck directory structure with feature flag
(#7090)
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## Summary
Adds initial rocm_ck directory structure, #7119.
- Establishes production `rocm_ck/` directory at
`composablekernel/rocm_ck/`, peer to `tile_engine/` and `dispatcher/`
- Adds `CK_ENABLE_ROCM_CK` option (default OFF) as a CK-internal feature
flag — no superbuild or TheRock changes needed
- Creates `rocm_ck` INTERFACE library, `ck_tile_headers` target, GTest
integration with builder-style convenience targets (`smoke-rocm-ck`,
`check-rocm-ck`)
- Adds Jenkins `RUN_ROCM_CK_TESTS` parameter for CI, following the
`RUN_BUILDER_TESTS` pattern
- README explains the constexpr schema model: host-device separation via
constexpr data rather than template parameters, enabling multi-arch
distribution through kpack archives
## Test plan
- [x] `cmake -DCK_ENABLE_ROCM_CK=ON` configures without errors
- [x] `ninja check-rocm-ck` passes (4 host-only index type tests)
- [x] Default build (`CK_ENABLE_ROCM_CK=OFF`) is unaffected — no rocm_ck
targets present
- [x] Jenkins `RUN_ROCM_CK_TESTS=true` enables the flag and runs
`check-rocm-ck`
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