Added script for icevision inference installation

[ai-fast-track]

Added script for icevision inference installation for both Colab and for a minimal installation

[codecov]

Codecov Report

Merging #893 (7ad9991) into master (773a702) will not change coverage.
The diff coverage is n/a.

❗ Current head 7ad9991 differs from pull request most recent head 579a730. Consider uploading reports for the commit 579a730 to get more accurate results

@@           Coverage Diff           @@
##           master     #893   +/-   ##
=======================================
  Coverage   87.62%   87.62%           
=======================================
  Files         232      232           
  Lines        4994     4994           
=======================================
  Hits         4376     4376           
  Misses        618      618           

Flag	Coverage Δ
unittests	87.62% <ø> (ø)

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Impacted Files	Coverage Δ
icevision/models/inference.py	75.38% <0.00%> (ø)

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