[CIS-1592] Fix file mime-types and attachment type

[nuno-vieira]

🔗 Issue Link

CIS-1592

🎯 Goal

• Align the file mime-types with the other SDKs
• When adding a file from the File Picker, resolve the correct attachment type

🛠 Implementation

• Fix the incorrect mime-type and add missing ones
• When adding a file in the composer, resolve the attachment type through the file extension

🎨 UI Changes

Adding an image through the file picker:

ResolvingAttachmentType.mp4

🧪 Testing

Scenario 1:

1. Open a chat
2. Add a file attachment with extension .rtf
3. Check the HTTP Request - mime-type should be text/rtf

Scenario 2:

1. Open a chat
2. Add an image from the File Picker (Instead of Photo & Video Picker)
3. Composer should preview the image
4. Image should be added to the message list successfully

Note: When importing audio files from the File Picker, nothing will render
since we currently don't support audio files in the iOS SDK

☑️ Contributor Checklist

• I have signed the Stream CLA (required)
• Changelog is updated with client-facing changes
• New code is covered by unit tests
• This change follows zero ⚠️ policy (required)
• Comparison screenshots added for visual changes
• Affected documentation updated (docusaurus, tutorial, CMS)

[evsaev]

LGTM! 🚢

[nuno-vieira]

Converted to draft to make sure we should do: "When adding a file from the File Picker, resolve the correct attachment type"

[codecov]

Codecov Report

Merging #1873 (11020b7) into develop (74fabd6) will decrease coverage by 0.05%.
The diff coverage is 97.22%.

@@             Coverage Diff             @@
##           develop    #1873      +/-   ##
===========================================
- Coverage    86.00%   85.94%   -0.06%     
===========================================
  Files          237      238       +1     
  Lines        11526    11556      +30     
===========================================
+ Hits          9913     9932      +19     
- Misses        1613     1624      +11     

Flag	Coverage Δ
llc-tests	85.94% <97.22%> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...treamChat/Models/Attachments/AttachmentTypes.swift	88.31% <94.44%> (+1.64%)	⬆️
...reamChat/APIClient/Endpoints/DeviceEndpoints.swift	100.00% <100.00%> (ø)
.../CurrentUserController/CurrentUserController.swift	85.71% <100.00%> (+0.52%)	⬆️
Sources/StreamChat/Models/PushProvider.swift	100.00% <100.00%> (ø)
...ources/StreamChat/Workers/CurrentUserUpdater.swift	95.77% <100.00%> (+0.06%)	⬆️
Sources/StreamChat/Utils/Logger/Logger.swift	50.29% <0.00%> (-5.99%)	⬇️

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