Add Gherkin comments support

[olexale]

This PR adds Gherkin comments support

Fix #115

[Copilot]

Pull Request Overview

This PR adds Gherkin comments support to the codebase by implementing parsing and filtering for lines that start with '#'. The implementation ensures that comment lines are ignored during feature file processing.

• Adds support for recognizing Gherkin comment lines starting with '#'
• Filters out comment lines during feature file processing
• Adds comprehensive test coverage for comment handling

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
lib/src/bdd_line.dart	Adds comment line type enum and parsing logic with comment markers
lib/src/feature_file.dart	Filters out comment lines during preprocessing
test/comment_test.dart	Adds dedicated test case for comment handling
test/full_set_test.dart	Updates existing test with comment examples

Comments suppressed due to low confidence (3)

test/comment_test.dart:1

• Corrected escaping of single quotes in string literal.

import 'package:bdd_widget_test/src/feature_file.dart';

test/comment_test.dart:1

• Corrected escaping of single quotes in string literal.

import 'package:bdd_widget_test/src/feature_file.dart';

test/comment_test.dart:1

• Corrected escaping of single quotes in string literal.

import 'package:bdd_widget_test/src/feature_file.dart';

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