impl tags api (#2)

.env

.env.template

.gitignore

Cargo.toml

migration/README.md

migration/src/m20220101_000001_create_table.rs

src/api/mod.rs

src/api/tag.rs

src/entity/dialog2_kb.rs

src/entity/dialog_info.rs

src/entity/doc2_doc.rs

src/entity/doc_info.rs

src/entity/kb2_doc.rs

src/entity/kb_info.rs

src/entity/mod.rs

src/entity/tag2_doc.rs

src/entity/tag_info.rs

src/entity/user_info.rs

src/main.rs

src/service/dialog_info.rs