[mlir][tblgen] add concrete create methods (#147168)
Currently `builder.create<...>` does not in any meaningful way hint/show
the various builders an op supports (arg names/types) because [`create`
forwards the args to
`build`](https://github.com/llvm/llvm-project/blob/887222e3526fbe08e748a33f740296ac22bf1ab1/mlir/include/mlir/IR/Builders.h#L503).
To improve QoL, this PR adds static create methods to the ops themselves
like
```c++
static arith::ConstantIntOp create(OpBuilder& builder, Location location, int64_t value, unsigned width);
```
Now if one types `arith::ConstantIntO::create(builder,...` instead of
`builder.create<arith::ConstantIntO>(...` auto-complete/hints will pop
up.
See
https://discourse.llvm.org/t/rfc-building-mlir-operation-observed-caveats-and-proposed-solution/87204/13
for more info.
