[cmake]:implement CMake build for NuttX Lua interpreter

[xuxin930]

Summary

add CMake module for register lua mod

# example in luamod CMakeLists.txt

nuttx_add_luamod(MODS hello)

nsh> lua
Lua 5.4.0  Copyright (C) 1994-2020 Lua.org, PUC-Rio
> hello.say_hello()
Hello World!
> io.write("abs is =",math.abs(-10),"\n")
abs is =10
> os.exit()
nsh>

Impact

Testing

CI

[cederom]

Thank you @xuxin930 :-)

[yamt]

nsh> lua
Lua 5.4.0  Copyright (C) 1994-2020 Lua.org, PUC-Rio
> hello.say_hello()
Hello World!
> io.write("abs is =",math.abs(-10),"\n")
abs is =10
> os.exit()
nsh>

are you using some uncommitted changes?
nuttx_linit.c doesn't seem to register os or io.