Introduce Dataset GUI

[bobbai00]

This PR introduces the GUI of datasets. Users can view datasets, create new dataset/dataset version, and preview files in datasets across different versions. For the webserver part of the dataset, see #2391 .

Features

1. Browser all accessible datasets

2. View Dataset Details

3. Create a new Dataset

4. Create a new Dataset Version

Components

1. Common Components

One common components are introduced:

• files-uploader
  this component provides the encapsulation of file uploading logics. It uses ngx-file-drop, which allows directories to be dragged and dropped, and pertain the complete file tree structure of the uploaded directories:

2. Dataset-centric Components

Several dataset-related components are introduced. Their structures are as follow:

user-dataset // folder of datasets
  - user-dataset.component // components to render a list of datasets, one of the tabs on the left
  - user-dataset-list-item // component to render dataset as a list item
  - user-dataset-explorer // folder, includes components that display the details of datasets
     - user-dataset-file-renderer // component to render the preview of files of different MIME formats
     - user-dataset-version-creator // component that is used to create new dataset/dataset version
     - user-dataset-version-filetree // component to render the file tree of dataset versions
     - user-dataset-explorer.component // component to provide the full view of a dataset, including versions switch, file preview

• user-dataset & user-dataset-list-item

• user-dataset-explorer

• user-dataset-file-renderer

• user-dataset-version-creator

• user-dataset-version-filetree

Other fix

• full text search of datasets is refactored based on new full text search framework
• some backend dataset APIs are fixed