feat(snapshot) add API to take snapshot for object (#2353)

* Fix image zooming causes unexpected object size.

Signed-off-by: Xu Xingliang <xuxingliang@xiaomi.com>

* add lv_snapshot_take API.

* fix(img) invalidate size and layout on zoom and angle change

* fix(img) not self-repeating under some zoom level.

* fix(snapshot) fix to keep the original position

* Move various set_px_cb_xx functions to lv_hal_disp.c

* add snapshot API to store image to provided buffer

* minor fixes and refactoring

* Move snapshot source to extra/others/snapshot.

1. Update parameter buff to buf.
2. Add macro to disable lv_snapshot, enabled by default.

* docs(others) add the others folder with snapshot.md

* docs(snapshot) added doc and example for snapshot.

1. Update doc snapshot.md
2. Add example lv_example_snapshot_1 to folder examples/others/snapshot
3. Update lv_conf_template.h and lv_conf_internal.h
4. Remove lv_snapshot.c from lv_misc.mk
5. Add others to index.md

Signed-off-by: Xu Xingliang <xuxingliang@xiaomi.com>

* add micropython example for snapshot

Co-authored-by: Xu Xingliang <xuxingliang@xiaomi.com>
Co-authored-by: Gabor Kiss-Vamosi <kisvegabor@gmail.com>

docs/index.md

@@ -34,6 +34,7 @@ PDF version: :download:`LVGL.pdf <LVGL.pdf>`
    overview/index
    widgets/index
    layouts/index
+   others/index
    CONTRIBUTING
    CHANGELOG
    ROADMAP