fix: Improve error handling in the plugin config model parser of hgctl

[CH3CHO]

Ⅰ. Describe what this PR did

Improve error handling in the plugin config model parser of hgctl.

1. Fix typos in variable and method names.
2. Return field name and related info when unable to parse a specific model field.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 40.00000% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 38.15%. Comparing base (08e5678) to head (c7c782a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #891      +/-   ##
==========================================
+ Coverage   38.12%   38.15%   +0.02%     
==========================================
  Files          61       61              
  Lines       10438    10438              
==========================================
+ Hits         3980     3983       +3     
+ Misses       6158     6156       -2     
+ Partials      300      299       -1     

Files	Coverage Δ
pkg/cmd/hgctl/plugin/types/model_parser.go	69.20% <40.00%> (ø)

... and 1 file with indirect coverage changes

[WeixinX]

LGTM