ci: add pr test and lint

[Mercy811]

• .github/workflows/ci.yml
  • Run test and linter on pull request.
• .github/workflows/semantic-pr.yml
  • Add semantic check
• lib/web/amplitude_js.dart
  • Not sure if changing to camel case will break it so ignore lint rule for these two
• example/*.*,
  • fix current lint errors by dart fix --apply

> flutter analyze                                                                                                                                                                                                                                                           ─╯
Analyzing Amplitude-Flutter...                                          

   info • The import of 'package:flutter/foundation.dart' is unnecessary because all of the used elements are also provided by the import of 'package:flutter/material.dart' • example/lib/app_state.dart:2:8 • unnecessary_import
   info • 'headline5' is deprecated and shouldn't be used. Use headlineSmall instead. This feature was deprecated after v3.1.0-0.0.pre • example/lib/deviceid_sessionid.dart:16:66 • deprecated_member_use
   info • 'headline5' is deprecated and shouldn't be used. Use headlineSmall instead. This feature was deprecated after v3.1.0-0.0.pre • example/lib/deviceid_sessionid.dart:31:67 • deprecated_member_use
   info • 'headline5' is deprecated and shouldn't be used. Use headlineSmall instead. This feature was deprecated after v3.1.0-0.0.pre • example/lib/event_form.dart:25:58 • deprecated_member_use
   info • 'headline5' is deprecated and shouldn't be used. Use headlineSmall instead. This feature was deprecated after v3.1.0-0.0.pre • example/lib/flush_thresholds_form.dart:42:68 • deprecated_member_use
   info • 'headline5' is deprecated and shouldn't be used. Use headlineSmall instead. This feature was deprecated after v3.1.0-0.0.pre • example/lib/group_form.dart:32:68 • deprecated_member_use
   info • 'headline5' is deprecated and shouldn't be used. Use headlineSmall instead. This feature was deprecated after v3.1.0-0.0.pre • example/lib/group_identify_form.dart:44:67 • deprecated_member_use
   info • 'headline5' is deprecated and shouldn't be used. Use headlineSmall instead. This feature was deprecated after v3.1.0-0.0.pre • example/lib/identify_form.dart:38:61 • deprecated_member_use
   info • 'bodyText1' is deprecated and shouldn't be used. Use bodyLarge instead. This feature was deprecated after v3.1.0-0.0.pre • example/lib/my_app.dart:115:67 • deprecated_member_use
   info • 'headline5' is deprecated and shouldn't be used. Use headlineSmall instead. This feature was deprecated after v3.1.0-0.0.pre • example/lib/revenue_form.dart:41:60 • deprecated_member_use
   info • 'headline5' is deprecated and shouldn't be used. Use headlineSmall instead. This feature was deprecated after v3.1.0-0.0.pre • example/lib/user_id_form.dart:22:68 • deprecated_member_use
   info • 'headline5' is deprecated and shouldn't be used. Use headlineSmall instead. This feature was deprecated after v3.1.0-0.0.pre • example/lib/user_id_form.dart:30:60 • deprecated_member_use
   info • The variable name 'opt_callback' isn't a lowerCamelCase identifier • lib/web/amplitude_js.dart:41:17 • non_constant_identifier_names
   info • The variable name 'opt_error_callback' isn't a lowerCamelCase identifier • lib/web/amplitude_js.dart:42:17 • non_constant_identifier_names

14 issues found. (ran in 1.0s)

[github-actions]

🎉 This PR is included in version 4.0.0-beta.1 🎉

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