[misc] Version bump: v0.8.3->v0.8.4 (taichi-dev#3295)

[refactor] Rename nparray to external_array in Python-side (taichi-de…

…v#3191)

* [refactor] Rename nparray to external_array in Python-side

* Auto Format

Co-authored-by: Taichi Gardener <[email protected]>

[bug] Fix the mapping from virtual axes to physical axes (taichi-dev#…

…3159)

* [bug] Fix the mapping from virtual axes to physical axes

* Auto Format

Co-authored-by: Taichi Gardener <[email protected]>

[vulkan] Disable Vulkan validation layer (taichi-dev#3050)

* [refactor] Respect NDEBUG

* fix?

* hacky fix

[release] v0.8.0 (taichi-dev#2974)

[release] v0.7.32 (taichi-dev#2901)

[release] v0.7.31 (taichi-dev#2867)

[release] v0.7.31 (taichi-dev#2867)

[release] v0.7.30 (taichi-dev#2799)

[release] v0.7.29 (taichi-dev#2666)