[refactor] Remove import taichi from lang/__init__.py (#3889)
[refactor] Remove import taichi from lang/__init__.py (#3889)

Co-authored-by: Taichi Gardener <52844ac7498fba84f633481a7c3ae54491811c81@gmail.com>
yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi,yuanming-hu/taichi