Factorized schema_editor() at BaseDatabaseWrapper level
Fixed #8408 -- Added ModelAdmin.show_full_result_count to avoid COUNT() query.

Thanks lidaobing for the suggestion.
Fixed #23460 -- Added literal `%s` support to extra() QuerySets.
Fixed #23561 -- Corrected a security doc example that requires an unquoted HTML attribute.

Thanks "djbug" for the report.
How many is two?
Fixed #23560 -- Fixed MigrationWrite to handle builtin types without imports.

Thanks Tim Graham for the review.
Silenced some deprecation warnings in contrib.sitemaps; refs #22384.
Fixed #22738 -- Abstracted boolean field type introspection

Thanks maxi for the report, Shai Berger for his help with the patch
and Tim Graham for the review.