Fixed #36410 -- Added support for Template Partials to the Django Template Language.

Introduced `{% partialdef %}` and `{% partial %}` template tags to
define and render reusable named fragments within a template file.
Partials can also be accessed using the `template_name#partial_name`
syntax via `get_template()`, `render()`, `{% include %}`, and other
template-loading tools.

Adjusted `get_template()` behavior to support partial resolution, with
appropriate error handling for invalid names and edge cases. Introduced
`PartialTemplate` to encapsulate partial rendering behavior.

Includes tests and internal refactors to support partial context
binding, exception reporting, and tag validation.

Co-authored-by: Carlton Gibson <carlton@noumenal.es>
Co-authored-by: Natalia <124304+nessita@users.noreply.github.com>
Co-authored-by: Nick Pope <nick@nickpope.me.uk>

1 files changed, 2 insertions, 0 deletions

diff --git a/tests/template_tests/templates/partial_base.html b/tests/template_tests/templates/partial_base.html
new file mode 100644
index 0000000000..c23da046f5
--- /dev/null
+++ b/tests/template_tests/templates/partial_base.html
@@ -0,0 +1,2 @@
+{% block main %}
+{% endblock main %}