[feat] GH-Actions for static code analysis

[opxdelwin]

Tell us about the task you want to perform and are unable to do so because the feature is not available
Enable GitHub Actions for this project to automate static Flutter Code Analysis

Describe the solution/feature you'd like us to add
Building appropriate pipeline that'd test relevant commits for code analysis issue.

Any other feedback you would like to provide regarding the site
A comprehensive discussion must be carried out with the community to fix existing analysis issue, whose fix would be addressed in upcoming PRs. Here are few highlighted analysis issue, for which maintainers may suggest appropriate actions.

See Detailed Table

Serial No.	Status	Issue	Location	Suggested Action
1.		Invalid option specified for 'enable-experiment': Flag "records" is no longer required.	analysis_options.yaml	Remove
2.		The parameter type of '==' operators should be non-nullable. Try using a non-nullable type.	lib\models\form_data_model.freezed.dart	Add Lint Ignore
3.		The parameter type of '==' operators should be non-nullable. Try using a non-nullable type.	lib\models\name_value_model.freezed.dart
4.		The value of the local variable 'length' isn't used. Try removing the variable or using it.	lib\screens\home_page\editor_pane\details_card\request_pane\request_headers.dart	Remove unused vars
5.		The value of the local variable 'length' isn't used. Try removing the variable or using it.	lib\screens\home_page\editor_pane\details_card\request_pane\request_params.dart	Remove unused vars
6.		This method overrides a method annotated as '@mustCallSuper' in 'State', but doesn't invoke the overridden method.	lib\widgets\headerfield.dart	Add Annotation
7.		This method overrides a method annotated as '@mustCallSuper' in 'State', but doesn't invoke the overridden method.	lib\widgets\json_previewer.dart	Add Annotation
8.		Unused import: 'package:apidash/main.dart'. Try removing the import directive.	test\widget_test.dart	For Code Coverage, Fixed in #158
9.		Unused import: 'package:flutter/material.dart'. Try removing the import directive.	test\widgets\markdown_test.dart	Remove imports
10.		The variable name '_$$_NameValueModelFromJson' isn't a lowerCamelCase identifier. Try changing the name to follow the lowerCamelCase style. (x2)	lib\models\name_value_model.g.dart	Generated Code, add lint ignore.
11.		TODO (x4)	-	Wont break analysis, but better to fix to prevent tech-debt

Once we're at par with above mentioned issues, I'll fix them within the main Actions PR itself.

Awaiting everyone's valuable feedback.

[opxdelwin]

@ashitaprasad @animator Please share your feedback with reference to serial number..

[animator]

It will be added to the roadmap but currently it is not a priority as we have other major features to work on.

[opxdelwin]

What if I already have a PR ready :) ?

[ashitaprasad]

@opxdelwin Then you can send across a PR. We'll take a look at it.