Enable use of image stanza in pyflyte register and other small changes

[eapolinario]

TL;DR

pyflyte register is now able to load images present in the config file. That sub-command also requires a version in non-fast case.

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

Complete description

Changes to pyflyte register:

1. The output of the command now is more explicit about which serialization settings are used, which include the images allowed to be used.
2. Force version in non fast. The idea is to make it clear that this option requires the user to be deliberate about versions when registering entities using the non-fast option.
3. Allow for images present in a config file to be used during registration

Tracking Issue

https://github.com/flyteorg/flyte/issues/

Follow-up issue

NA
OR
https://github.com/flyteorg/flyte/issues/

[codecov]

Codecov Report

Merging #1227 (5cfbcea) into master (63ad4fc) will increase coverage by 0.05%.
The diff coverage is 91.11%.

@@            Coverage Diff             @@
##           master    #1227      +/-   ##
==========================================
+ Coverage   68.57%   68.63%   +0.05%     
==========================================
  Files         288      288              
  Lines       26224    26279      +55     
  Branches     2929     2935       +6     
==========================================
+ Hits        17984    18036      +52     
- Misses       7762     7764       +2     
- Partials      478      479       +1     

Impacted Files	Coverage Δ
flytekit/clis/sdk_in_container/register.py	79.68% <62.50%> (-3.08%)	⬇️
flytekit/clis/sdk_in_container/helpers.py	92.59% <92.85%> (-0.27%)	⬇️
flytekit/clis/sdk_in_container/run.py	84.05% <100.00%> (-0.15%)	⬇️
tests/flytekit/unit/cli/pyflyte/test_register.py	100.00% <100.00%> (ø)
flytekit/core/type_engine.py	59.38% <0.00%> (ø)
tests/flytekit/unit/core/test_serialization.py	93.20% <0.00%> (ø)
tests/flytekit/unit/core/test_type_engine.py	98.43% <0.00%> (+0.03%)	⬆️
tests/flytekit/unit/core/test_node_creation.py	95.79% <0.00%> (+0.07%)	⬆️
flytekit/core/promise.py	51.95% <0.00%> (+0.17%)	⬆️
flytekit/core/node.py	53.76% <0.00%> (+0.50%)	⬆️
... and 1 more

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