Add new function list_namespaced_stateful_set_by_pattern

\<Add function list_namespaced_stateful_set_by_pattern>

Fixes #\<#113>

Before merge following needs to be applied:

[x] At least one example testcase added in testcases/
[x] Library Documentation regenerated according to Generate docs
[x] PR entry added in CHANGELOG.md in In progress section
[x] All new testcases tagged as prerelease along other tags to exclude it from execution until released on PyPI
[x] Coverage threshold increased in .coveragerc if new coverage is higher than actual, see the lint-and-coverage step in CI
```
fail_under = 86
```

devopsspiral / KubeLibrary