plugin of urban model for landcover

[emmaai]

Major change:

• add plugin for urban model
• make TensorFlow multithreading safely with dask worker and threads

The diagram is as below:

Minor change:

• update dependencies in docker image

Note:
The performance/accuracy of model itself is not guaranteed in this implementation. It was and will be dealt with separately.

[codecov]

Codecov Report

Attention: Patch coverage is 86.09626% with 26 lines in your changes missing coverage. Please review.

Project coverage is 78.41%. Comparing base (89ddfb8) to head (ab56f58).

Files	Patch %	Lines
odc/stats/plugins/lc_tf_urban.py	76.53%	23 Missing ⚠️
odc/stats/proc.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #143      +/-   ##
===========================================
+ Coverage    78.00%   78.41%   +0.40%     
===========================================
  Files           40       43       +3     
  Lines         3738     3924     +186     
===========================================
+ Hits          2916     3077     +161     
- Misses         822      847      +25     

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[SpacemanPaul]

LGTM