[Mobile] Implement Backend Connection for Text Annotation

[atillaturkmen]

I was assigned to implement the backend connection for text annotations in our group meeting during this week's lab session.

These are the tasks to complete this issue:

• [x] Create a new branch.
• [x] Implement receiving all text annotations for a page.
• [x] Show text annotations on the page.
• [x] Send new annotations to the backend.

Deadline: 27/12/2022 11:00 Reviewer: @canatakan

[atillaturkmen]

Here is an example text annotation from our app that conforms to web annotation data model:

{
    "_id": "63aa3a18f6b64fb7e78bb5f4",
    "@context": "http://www.w3.org/ns/anno.jsonld",
    "type": "Annotation",
    "creator": "https://ideart.tk/profile/stevecarell",
    "body": [
        {
            "type": "TextualBody",
            "value": "example annotation body",
            "purpose": "commenting"
        }
    ],
    "target": {
        "source": "https://ideart.tk/artitem/111",
        "selector": {
            "type": "TextPositionSelector",
            "start": 3,
            "end": 16
        }
    },
    "id": "c_#0b08cce4-e368-4a41-b29f-702f4261ca93"
}

[atillaturkmen]

I have created a pull request and added @canatakan as the reviewer. https://github.com/bounswe/bounswe2022group7/pull/622

[canatakan]

After your updates according to the requested changes, I merged your pull request. This issue can be closed.