* add: basic recommendations endpoint
* add: POST `/recommendations/models` recommendations endpoint
* add: get specific model endpoint
* add: DELETE `/recommendations/models/:id` and GET all models recommendations endpoint
* add: ONNX model upload endpoint
* add: save the file as a .tar.gz instead of ONNX
* add: verify_tar_gz function
* add: support for model upload
* add: PUT `/recommendations/model/:id` to update the model, name, collection
* refactor: recommendations -> personalization
* add: personalization tests
* add: personalization_model_manager_tests
* fix: review comments
* fix: review comments
* add: support for .tar.gz files
* refactor: binary_body parsing and move content-type to http_server.h
* add: libarchive
* update: BUILD file
* fxi: bazel convecntions
* add: archive utils helper classes
* fix: memory leaks
* refactor: change the flow to cleanup everything at last
* add: archiver tests
* rm: test endpoints
* fix: set data-dir on ArchiveUtilsTest
* add: a const value in http_data.h
* fix: a const value in http_data.h
