Add the A* algorithm.

[zjl9959]

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A* algorithm is a commonly used and efficient 2D grid pathfinding algorithm. @64json Please take a look.

This is the visualization result:

PS: I'm working on an algorithm animation engine for Python called algviz. You can take a look if interested. Thanks!

[zjl9959]

This is the CI failed log:

node: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.27' not found (required by node)

node: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.25' not found (required by node)

node: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.28' not found (required by node)

The command "npm config set spin false" failed and exited with 1 during .

Seems the test machine didn't startup normally.