Draft: Resolve "Allow creation of custom LessonEvents"

Closes #237

changed milestone to %2a. Collect and analyse feedback from pilot schools after working with manual planning for a year

added part::backend part::frontend prio::1 source::customer::fss source::customer::hns type::bug workflow::current-todo labels

requested review from @ZugBahnHof

assigned to @hansegucker

added 1 commit

• 511581d9 - TMP Create LessonEventDialog

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added 2 commits

• 353b358a - Fix typo
• b4e5cbfe - Add create button component correctly

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added 15 commits

• b4e5cbfe...9fa9e387 - 5 commits from branch master
• c9b96507 - Merge remote-tracking branch 'origin/master' into 237-allow-creation-of-custom-lessonevents
• 47d31b04 - Add labels and their translations for fields of LessonEventDialog
• 90506dfd - Reorder fields of LessonEventDialog and comment slotNumber* fields
• 4916b3b7 - Use standard fields in AmendLesson.vue
• cfe1d2b9 - Make AmendLesson comment field wider and narrower with auto-grow
• e48628aa - Use fields from AmendLesson in LessonEventDialog
• dd40ef70 - Add GroupField to LessonEventDialog
• 701fabb9 - Add CourseField to LessonEventDialog
• 4bc0d3a8 - Remove unused item arg
• d58c68d4 - Fill LessonEventDialog with course fields if selected and appropriate

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added 3 commits

• 2c94b3cf - Fix wrong casing in lessonEvent.graphql
• 68375c2e - Add rules for custom lesson events
• d5b59fa6 - Add LessonEventsBatchCreateMutation

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added 20 commits

• d5b59fa6...3ec50a95 - 10 earlier commits
• 7bcffe67 - Add CourseField to LessonEventDialog
• cc0288cf - Remove unused item arg
• c5831bc2 - Fill LessonEventDialog with course fields if selected and appropriate
• b3b617a2 - Fix wrong casing in lessonEvent.graphql
• 09c999c3 - Add rules for custom lesson events
• 4cec0f43 - Add LessonEventsBatchCreateMutation
• 9e12936a - Rename LessonEventsBatchCreateMutation to singular
• 9468bba6 - Change type_name of AmendLessonBatchCreateMutation to not nameclash
• b63b039c - Fix handleCourse's setting of the course itself.
• 06bc1343 - Add managed_by_app_label to LessonEvent's meta object

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mentioned in merge request AlekSIS-Core!1805