MAINT: allow the apply_list_of_updates function to be used elsewhere

Summary

This extracts the old push_identifiables_to_caosdb function from the crawler and allows other programms to use the logic.

Test Environment

Unit and integration tests

Check List for the Author

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• All automated tests pass
• Reference related Issues
• Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
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CHANGELOG.md

@@ -7,10 +7,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased] ##
 
 ### Added ###
-- `check_reference_field` function to check whether entities with provided ids
-  exits (for example when importing data from a table)
-- added the `datatypes` argument to `TableImporter` for columns that do not 
-  need a special conversion function
 
 ### Changed ###
 
@@ -22,6 +18,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Security ###
 
+## [0.3.1] - 2021-12-06  ##
+
+### Added ###
+- `check_reference_field` function to check whether entities with provided ids
+  exits (for example when importing data from a table)
+- added the `datatypes` argument to `TableImporter` for columns that do not 
+  need a special conversion function
+
 ## [0.3.0] - 2021-11-02 ##
 
 ### Added ###