feat: add decision tree classifier and random forest regressor implementations

another commit.

правки

feat(project): add project router, add nullable subject processing.

refactor(main-page): remove unused import of RouterLink.

feat(notifications, order-form): add notifications before order creating, add success, info, warning, error notifications (now it's a type, it's a method)

feat(notifications, order-form): add notifications for http requests.

feat(project): add project router, add nullable subject processing.

fix(projects repo) 5 now is a default value for education_class into delete method.

fix(projects): make scheeme and repo now that subject can be none.

refactor(main-page): remove unused import of RouterLink.

feat(notifications, order-form): add notifications before order creating, add success, info, warning, error notifications (now it's a type, it's a method)

feat(notifications, order-form): add notifications for http requests.

feat(project-edit): remove students dropdown when disabled.

fix(project-edit): add authors change ability.

feat(projects): split edit query for projects into small ones, change subject field to NameAndId field, add main_photo field for project model, add unique constraints for project photos/files models.

feat(projects): split edit query for projects into small ones, change subject field to NameAndId field, add main_photo field for project model, add unique constraints for project photos/files models.

feat(projects): split edit query for projects into small ones, change subject field to NameAndId field, add main_photo field for project model, add unique constraints for project photos/files models.

fixup! squash! fixup! fixup! feat(projects): split edit query for projects into small ones, change subject field to NameAndId field, add main_photo field for project model, add unique constraints for project photos/files models.

squash! fixup! fixup! feat(projects): split edit query for projects into small ones, change subject field to NameAndId field, add main_photo field for project model, add unique constraints for project photos/files models.

fixup! fixup! feat(projects): split edit query for projects into small ones, change subject field to NameAndId field, add main_photo field for project model, add unique constraints for project photos/files models.

fixup! fixup! feat(projects): split edit query for projects into small ones, change subject field to NameAndId field, add main_photo field for project model, add unique constraints for project photos/files models.

feat(project-edit): add author logic.

feat(project-edit): add photos saving logic.

feat(project-edit): add saving files logic.

feat(project-edit): make save button for main_form hide while it's not editable.

fixup! feat(projects): split edit query for projects into small ones, change subject field to NameAndId field, add main_photo field for project model, add unique constraints for project photos/files models.

feat(students): add rout to get all students with fio and id.

feat(projects): split edit query for projects into small ones, change subject field to NameAndId field, add main_photo field for project model, add unique constraints for project photos/files models.

feat(students): add rout to get all students with fio and id.