Add if_not_exists parameter to create_collection#1149

veeceey wants to merge 4 commits intoqdrant:masterqdrant/qdrant-client:masterfrom

veeceey:fix/issue-1022-create-collection-if-not-existsveeceey/qdrant-client:fix/issue-1022-create-collection-if-not-existsCopy head branch name to clipboard