[AIRFLOW-5717] Add get_tree_map method to SFTPHook

[TobKed]

Make sure you have checked all steps below.

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• 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-5717
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Tests

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[mik-laj]

Can you create a variables from this callback. Now it's hard to read.

[TobKed]

Sure, I've refactored this part in little bit different way to avoid redundant code.

[codecov-io]

Codecov Report

Merging #6387 into master will decrease coverage by 0.91%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #6387      +/-   ##
==========================================
- Coverage   80.59%   79.68%   -0.92%     
==========================================
  Files         626      626              
  Lines       36243    36257      +14     
==========================================
- Hits        29211    28891     -320     
- Misses       7032     7366     +334

Impacted Files	Coverage Δ
airflow/contrib/hooks/sftp_hook.py	94.79% <100%> (+0.88%)	⬆️
airflow/operators/postgres_operator.py	0% <0%> (-100%)	⬇️
airflow/operators/mysql_operator.py	0% <0%> (-100%)	⬇️
airflow/operators/mysql_to_hive.py	0% <0%> (-100%)	⬇️
airflow/operators/generic_transfer.py	0% <0%> (-100%)	⬇️
airflow/kubernetes/volume_mount.py	44.44% <0%> (-55.56%)	⬇️
airflow/kubernetes/volume.py	52.94% <0%> (-47.06%)	⬇️
airflow/kubernetes/pod_launcher.py	45.25% <0%> (-46.72%)	⬇️
airflow/kubernetes/kube_client.py	33.33% <0%> (-41.67%)	⬇️
airflow/executors/celery_executor.py	41.04% <0%> (-35.08%)	⬇️
... and 18 more

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