[AIRFLOW-6104] [AIP-21] Rename Datastore opertors

[michalslowikowski00]

Rename Datastore operators

Jira

• My PR addresses the following Airflow Jira issues and references them in the PR title. For example, "[AIRFLOW-XXX] My Airflow PR"
  • https://issues.apache.org/jira/browse/AIRFLOW-6104
  • In case you are fixing a typo in the documentation you can prepend your commit with [AIRFLOW-XXX], code changes always need a Jira issue.
  • In case you are proposing a fundamental code change, you need to create an Airflow Improvement Proposal (AIP).
  • In case you are adding a dependency, check if the license complies with the ASF 3rd Party License Policy.

Description

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Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• In case of new functionality, my PR adds documentation that describes how to use it.
  • All the public functions and the classes in the PR contain docstrings that explain what it does
  • If you implement backwards incompatible changes, please leave a note in the Updating.md so we can assign it to a appropriate release

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@9b79c39). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #6853   +/-   ##
=========================================
  Coverage          ?   84.27%           
=========================================
  Files             ?      680           
  Lines             ?    38451           
  Branches          ?        0           
=========================================
  Hits              ?    32406           
  Misses            ?     6045           
  Partials          ?        0

Impacted Files	Coverage Δ
airflow/gcp/operators/datastore.py	61.53% <100%> (ø)
...low/contrib/operators/datastore_export_operator.py	100% <100%> (ø)
airflow/gcp/example_dags/example_datastore.py	100% <100%> (ø)
...low/contrib/operators/datastore_import_operator.py	100% <100%> (ø)

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