[weight] weight class to simplify headers

[weight] weight class to simplify headers

Added a weight class to simplify headers
All weight related enums and properties go to weight header
rather being dumped in layer or optimizer

V2:
Update swap to swap gradients even if not trainable
Update swap of Tensor, TensorDim to be friend functions
Copy and move assignements are now default

**Self evaluation:**
1. Build test: [x]Passed [ ]Failed [ ]Skipped
2. Run test: [x]Passed [ ]Failed [ ]Skipped

Signed-off-by: Parichay Kapoor <pk.kapoor@samsung.com>