feat: custom fields component to registration form (#29202)

.changeset/custom-fields.md

apps/meteor/app/api/server/v1/users.ts

...ts/AccountsCustomFields/AccountsCustomFieldsAssembler.tsx

apps/meteor/client/components/AccountsCustomFields/index.ts

apps/meteor/client/components/CustomFieldsForm.js

...eteor/client/views/account/profile/AccountProfileForm.tsx

...eteor/client/views/account/profile/AccountProfilePage.tsx

apps/meteor/client/views/admin/users/AddUser.js

apps/meteor/client/views/admin/users/EditUser.js

apps/meteor/client/views/admin/users/UserForm.js

...ews/omnichannel/customFields/CustomFieldsForm.stories.tsx

...nt/views/omnichannel/customFields/EditCustomFieldsPage.js

...ent/views/omnichannel/customFields/NewCustomFieldsForm.js

...ent/views/omnichannel/customFields/NewCustomFieldsPage.js

...annel/directory/chats/contextualBar/RoomEdit/RoomEdit.tsx

...annel/directory/contacts/contextualBar/ContactNewEdit.tsx

...mnichannel/directory/utils/formatCustomFieldsMetadata.tsx

.../meteor/client/views/root/MainLayout/RegisterUsername.tsx

packages/core-typings/src/CustomFieldMetadata.ts

packages/core-typings/src/index.ts