Backend paddle: allow enable prim to accelerate running #1948
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’prim‘ is a function in the paddle framework.
when running the code, high-order (K) operators can be disassembled into a combination of K-1 order operators and K-th order operators in the mode.
This mode can speed up the operation of some operators or support more operators to run on specific hardware devices.
This PR add a part of code which allow users to enable prim mode by using 'PRIM=1'. If enable i, the entire command become 'PRIM DDE_BACKEND=paddle python fractional_diffusion_1d.py'.