[FEATURE] Format column names

[ricardolsmendes]

What would you like to be added:
Support for column name formatting.

Why is this needed:
The Sisense BI Connector uses Entry Schemas to represent some asset fields. Data Catalog requires the ColumnSchema's column field to fit a specific bytes-size limit and character encoding, which is currently not supported by the connectors commons library but should be.

Below changes narrow down the scope of the present feature request:

1. Merge google.datacatalog_connectors.sisense.prepare.sisense_connector_strings_helper.py with google.datacatalog_connectors.commons.prepare.datacatalog_strings_helper.py.
2. Delete ...sisense.prepare.sisense_connector_strings_helper.py.
3. Refactor ...commons.prepare.DataCatalogStringsHelper to turn normalize_string into a public method.
4. Refactor ...commons.prepare.BaseEntryFactory to call ...commons.prepare.DataCatalogStringsHelper.normalize_string instead of declaring its own __normalize_string method as it will become a duplicate.
5. Refactor ...sisense.prepare.datacatalog_entry_factory.DataCatalogEntryFactory to call ...commons.prepare.DataCatalogStringsHelper.normalize_string as the
   current dependency will no longer exist after the refactoring.
6. Refactor ...sisense.prepare.datacatalog_tag_factory.DataCatalogTagFactory to call ...commons.prepare.DataCatalogStringsHelper.normalize_string as the current dependency will no longer exist after the refactoring.

[github-actions]

This issue has been automatically marked as stale because it hasn't had any activity in 60 days. It will be closed in 7 days if no further activity occurs (e.g. changing labels, comments, commits, etc.). Please feel free to tag a maintainer and ask them to remove the label if you think it doesn't apply. Thank you for submitting this issue and helping to make Google Data Catalog Connectors better!

[github-actions]

This issue has been automatically marked as stale because it hasn't had any activity in 60 days. It will be closed in 7 days if no further activity occurs (e.g. changing labels, comments, commits, etc.). Please feel free to tag a maintainer and ask them to remove the label if you think it doesn't apply. Thank you for submitting this issue and helping to make Google Data Catalog Connectors better!

[github-actions]

This issue has been automatically marked as stale because it hasn't had any activity in 60 days. It will be closed in 7 days if no further activity occurs (e.g. changing labels, comments, commits, etc.). Please feel free to tag a maintainer and ask them to remove the label if you think it doesn't apply. Thank you for submitting this issue and helping to make Google Data Catalog Connectors better!

[github-actions]

This issue has been automatically marked as stale because it hasn't had any activity in 60 days. It will be closed in 7 days if no further activity occurs (e.g. changing labels, comments, commits, etc.). Please feel free to tag a maintainer and ask them to remove the label if you think it doesn't apply. Thank you for submitting this issue and helping to make Google Data Catalog Connectors better!