major code refactor

[asroy]

major

• [x] Add license
• [x] use absolute path for header
• [x] fix header dependency: https://github.com/ROCmSoftwarePlatform/composable_kernel/issues/170
• [ ] Tensor operation naming: grid/block/warp/thread-level operation, conv/gemm/reduce/elementwise operation
• [x] https://github.com/ROCmSoftwarePlatform/composable_kernel/issues/198
• [ ] ~~https://github.com/ROCmSoftwarePlatform/composable_kernel/issues/169~~

misc

• [ ] https://github.com/ROCmSoftwarePlatform/composable_kernel/issues/146
• [x] use is_same_v instead of is_same https://github.com/ROCmSoftwarePlatform/composable_kernel/pull/175#discussion_r860513003
• [ ] https://github.com/ROCmSoftwarePlatform/composable_kernel/issues/90

[asroy]

@poyenc If you see any issue with the coding, please add them in the description above. I will fix them in a major refactor PR