Upgrade to Vue 3

[dwalizer]

Upgrade SkillTree to use vue3.

The following libraries will need to be upgraded:

Library	Current Version	Latest Version	Migration Info
@toast-ui/vue-editor	3.2.2	3.2.3	no current vue3 support, sample wrapper available - nhn/tui.editor#2309, nhn/tui.editor#2596
@vue/cli-plugin-babel	4.5.19	5.0.8	can probably run vue upgrade - https://cli.vuejs.org/migrations/migrate-from-v3.html
@vue/cli-plugin-e2e-nightwatch	4.5.19	5.0.8	can probably run vue upgrade - https://cli.vuejs.org/migrations/migrate-from-v3.html
@vue/cli-plugin-eslint	4.5.19	5.0.8	can probably run vue upgrade - https://cli.vuejs.org/migrations/migrate-from-v3.html
@vue/cli-plugin-unit-jest	4.5.19	5.0.8	can probably run vue upgrade - https://cli.vuejs.org/migrations/migrate-from-v3.html
@vue/cli-service	4.5.19	5.0.8	can probably run vue upgrade - https://cli.vuejs.org/migrations/migrate-from-v3.html
@vue/test-utils	1.2.1	2.4.3	version 2 supports vue 3 - https://test-utils.vuejs.org/migration/
eslint-plugin-vue	9.17.0	9.18.1	supports vue3 (3.2) but not entirely - https://eslint.vuejs.org/user-guide/
vee-validate	3.4.15	4.12.2	version 4 supports vue 3, but not vue 2 - API changed - logaretm/vee-validate#2849
vue	2.6.14	3.3.9	guide for migration - https://medium.com/simform-engineering/a-comprehensive-vue-2-to-vue-3-migration-guide-a00501bbc3f0
vue-apexcharts	1.6.1	1.6.2	supports vue 3 - vue3-apexcharts - https://apexcharts.com/docs/vue-charts/
vue-router	3.4.9	4.2.5	version 4 supports vue 3 - https://router.vuejs.org/guide/migration/
vue-select	3.18.3	3.20.2	vue 3 support on the beta channel - https://github.com/sagalbot/vue-select, sagalbot/vue-select#1597
vue-template-compiler	2.6.14	2.7.15	replaced by @vue/compiler-sfc, but now included as a dependency of main vue package
vue-virtual-scroll-list	2.3.2	2.3.5	unofficial (?) vue3-virtual-scroll-list exists - https://vue3-virtual-scroll-list-examples-xi.vercel.app/#/, https://github.com/reactjser/vue3-virtual-scroll-list
vuex	3.6.2	4.1.0	v4 supports vue 3 - https://vuex.vuejs.org/guide/migrating-to-4-0-from-3-x.html
vue-js-toggle-button	1.3.3	1.3.3	project seems to be no longer maintained, this project is a potential replacement - https://github.com/juliandreas/vue-toggles
vue-radial-progress	0.3.2	0.3.2	project seems to be no longer maintained, potential replacement here - https://github.com/jairoblatt/vue3-radial-progress
vue-simple-progress	1.1.1	1.1.1	project seems to be no longer maintained, potential replacement here - https://github.com/marcoschulte/vue3-progress
vue-simple-spinner	1.2.10	1.2.10	project seems to be no longer maintained
vuejs-datepicker	1.6.2	1.6.2	project seems to be no longer maintained, potential replacement here - https://github.com/Vuepic/vue-datepicker
@vue-a11y/announcer	2.1.0	2.1.0	have to use the next branch - https://vue-a11y.com/posts/vue-announcer/#meet-vue-announcer, https://github.com/vue-a11y/vue-announcer/tree/next
bootstrap-vue	2.21.2	2.23.1	version 2.23.1 supports migration build of vue 3- https://bootstrap-vue.org/vue3