add a changelog for SparsityPatternBase.

diff --git a/doc/news/changes/minor/20221125Wells b/doc/news/changes/minor/20221125Wells
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+Changed: All SparsityPattern classes now inherit from a new class SparsityPatternBase
+which provides an API for efficiently adding new entries. As a consequence of this change,
+the majority of templates over the sparsity pattern type have been removed.
+<br>
+(David Wells, 2022/11/25)