[FlyteCTL Feature] save registration process results into result_dir

[wckdman]

TL;DR

Save info about registered entities into a json/.yaml file

Type

• [ ] Bug Fix
• [x] Feature
• [ ] Plugin

Are all requirements met?

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

Complete description

WDYT about chosen arguments' names?

Tracking Issue

https://github.com/flyteorg/flyte/issues/3919

Follow-up issue

NA

[codecov[bot]]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (e41ec1e) 94.95% compared to head (d69dd5c) 51.03%. Report is 43 commits behind head on master.

Files	Patch %	Lines
flytekit/tools/repo.py	46.15%	6 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1904       +/-   ##
===========================================
- Coverage   94.95%   51.03%   -43.92%     
===========================================
  Files         136      171       +35     
  Lines        6165    16833    +10668     
  Branches        0     3493     +3493     
===========================================
+ Hits         5854     8591     +2737     
- Misses        311     7819     +7508     
- Partials        0      423      +423     

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[samhita-alla]

@eapolinario @pingsutw can you please review this PR?

[samhita-alla]

@wckdman, can you resolve the merge conflict?

[wckdman]

@samhita-alla Done ✅

[wckdman]

@samhita-alla @eapolinario @pingsutw ping :)