feat: add GHQ 12 survey

[matthiasn]

This pull request includes significant updates to the survey feature, including the addition of a new survey, refactoring of existing survey-related files, and dependency updates. The most important changes are summarized below:

Refactoring and Code Organization:

• lib/beamer/locations/journal_location.dart: Updated import path for fill_survey_page.dart to reflect its new location.
• lib/features/surveys/tools/calculate.dart: Renamed from lib/surveys/calculate.dart and modified the calculateScores function to handle different types of survey choices.
• lib/features/surveys/tools/run_surveys.dart: Renamed from lib/surveys/run_surveys.dart and added a new function runGhq12 for running the GHQ12 survey. [1] [2]
• lib/features/surveys/ui/fill_survey_page.dart: Renamed from lib/pages/create/fill_survey_page.dart and updated import paths.
• lib/widgets/charts/dashboard_survey_chart.dart: Updated to include the new GHQ12 survey and refactored survey type checks to use constants. [1] [2]
• lib/widgets/charts/dashboard_survey_data.dart: Added constants for survey task names and included the new GHQ12 survey in the surveyTypes map. [1] [2]

New Survey Addition:

• lib/features/surveys/definitions/ghq12_survey.dart: Added a new GHQ12 survey with multiple RPQuestionStep and RPInstructionStep instances, as well as completion and task definitions.

Dependency Updates:

• pubspec.yaml: Updated the research_package dependency to a specific commit from a GitHub repository. [1] [2]

Test Updates:

• test/pages/create/fill_survey_page_test.dart: Updated import paths to reflect the new location of fill_survey_page.dart.