Use wrappers from xnnpack.h for unary and binary ops (#11584) (#11666)

### Summary
This PR uses `xnn_define_binary` and `xnn_define_unary` to define
XNNPack ops, instead of separately calling the individual definitions.

Further changes:
1. Removes individual node definitions for unary and binary ops
2. Creates a wrapper macro to generate function defs for individual ops
using `xnn_define_binary` and `xnn_define_unary` inside.

Fixes #11584

### Test plan
```
## Build steps
cmake -DEXECUTORCH_BUILD_XNNPACK=ON ..
cmake --build cmake-out -j9

Tests ran:
./test/run_oss_cpp_tests.sh
.
.
.
100% tests passed, 0 tests failed out of 86
```

Author: abhinaykukkadapu

.gitignore

@@ -42,6 +42,9 @@ xcuserdata/
 *.xcworkspace/
 *.xcframework/
 
+# clangd
+.cache/
+
 # misc
 /.vscode/
 *.so