[AND-146] Intercept Attachment Download Process

[JcMinarro]

🎯 Goal

Provide some dependencies to allow intercepting the Attachemnt Download Process.
The DownloadAttachmentUriGenerator dependency allows our customers to build a custom url for the attaachment.
The DownloadRequestInterceptor dependency allows our customers to apply extra data on the DownloadManager.Request used to download the attachment

The Integration is added on the ChatUI and/or ChatTheme instances.

UI-Components:

ChatUI.downloadAttachmentUriGenerator = [....]
ChatUI.downloadRequestInterceptor = [...]

Compose UI:

ChatTheme(
  [...],
  downloadAttachmentUriGenerator = [...],
  downloadRequestInterceptor = [...],
)

🎉 GIF

[skydoves]

Overall looks good to me!