feat: adds openedx-filter hook to the child blocks of VerticalBlock

This commit adds a openedx-filters hook to the VerticalBlock XBlock
before rendering of it's children. This allows Open edX plugins to
customize the presentation of specific blocks based on the context.

docs/guides/hooks/filters.rst

@@ -181,3 +181,7 @@ well as the trigger location in this same repository.
    * - `DashboardRenderStarted <https://github.com/openedx/openedx-filters/blob/main/openedx_filters/learning/filters.py#L354>`_
      - org.openedx.learning.dashboard.render.started.v1
      - `2022-06-14 <https://github.com/eduNEXT/edx-platform/blob/master/common/djangoapps/student/views/dashboard.py#L878>`_
+
+   * - `VerticalChildRenderStarted <https://github.com/openedx/openedx-filters/blob/main/openedx_filters/learning/filters.py#L427>`_
+     - org.openedx.learning.veritical_child_block.render.started.v1
+     - `2022-08-18 <https://github.com/openedx/edx-platform/blob/master/xmodule/vertical_block.py#L122>`_

requirements/edx/base.txt

@@ -746,7 +746,7 @@ openedx-calc==3.0.1
     # via -r requirements/edx/base.in
 openedx-events==0.11.1
     # via -r requirements/edx/base.in
-openedx-filters==0.7.0
+openedx-filters==0.8.0
     # via
     #   -r requirements/edx/base.in
     #   lti-consumer-xblock

requirements/edx/development.txt

@@ -974,7 +974,7 @@ openedx-calc==3.0.1
     # via -r requirements/edx/testing.txt
 openedx-events==0.11.1
     # via -r requirements/edx/testing.txt
-openedx-filters==0.7.0
+openedx-filters==0.8.0
     # via
     #   -r requirements/edx/testing.txt
     #   lti-consumer-xblock

requirements/edx/testing.txt

@@ -921,7 +921,7 @@ openedx-calc==3.0.1
     # via -r requirements/edx/base.txt
 openedx-events==0.11.1
     # via -r requirements/edx/base.txt
-openedx-filters==0.7.0
+openedx-filters==0.8.0
     # via
     #   -r requirements/edx/base.txt
     #   lti-consumer-xblock

xmodule/vertical_block.py

@@ -13,6 +13,7 @@ from lxml import etree
 from web_fragments.fragment import Fragment
 from xblock.core import XBlock  # lint-amnesty, pylint: disable=wrong-import-order
 from xblock.fields import Boolean, Scope
+from openedx_filters.learning.filters import VerticalBlockChildRenderStarted
 from xmodule.mako_module import MakoTemplateBlockBase
 from xmodule.progress import Progress
 from xmodule.seq_module import SequenceFields
@@ -117,6 +118,13 @@ class VerticalBlock(
                 child_block_context['wrap_xblock_data'] = {
                     'mark-completed-on-view-after-delay': complete_on_view_delay
                 }
+
+            # .. filter_implemented_name: VerticalBlockChildRenderStarted
+            # .. filter_type: org.openedx.learning.vertical_block_child.render.started.v1
+            child, child_block_context = VerticalBlockChildRenderStarted.run_filter(
+                block=child, context=child_block_context
+            )
+
             rendered_child = child.render(view, child_block_context)
             fragment.add_fragment_resources(rendered_child)