Allow comma separate packages in pyflyte --pkgs

[wild-endeavor]

TL;DR

User reported frustration with the --pkgs switch. Users should be able to use comma-separated values in addition to specifying the click switch multiple times.

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Tracking Issue

flyteorg/flyte#2476

[codecov]

Codecov Report

Merging #999 (1d2e9b9) into master (cc2a4e7) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #999      +/-   ##
==========================================
+ Coverage   86.33%   86.34%   +0.01%     
==========================================
  Files         255      255              
  Lines       24323    24357      +34     
  Branches     2768     2771       +3     
==========================================
+ Hits        21000    21032      +32     
- Misses       2851     2853       +2     
  Partials      472      472              

Impacted Files	Coverage Δ
flytekit/clis/sdk_in_container/pyflyte.py	73.80% <100.00%> (+4.36%)	⬆️
tests/flytekit/unit/cli/pyflyte/test_package.py	89.83% <100.00%> (+0.54%)	⬆️
flytekit/configuration/file.py	82.63% <0.00%> (-0.06%)	⬇️
tests/flytekit/unit/configuration/test_internal.py	100.00% <0.00%> (ø)

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