CB-9022 Resolve source URI on background thread

[vladimir-kotikov]

Platforms affected

Android

What does this PR do?

This PR fixes application crash when trying to upload file from 'Content' file system, specified by cdvfile://localhost/content/... URI.

What testing has been done on this change?

Manual and automated testing

Checklist

• [x] ICLA has been signed and submitted to secretary@apache.org.
• [x] Reported an issue in the JIRA database
• [x] Commit message follows the format: "CB-3232: (android) Fix bug with resolving file paths", where CB-xxxx is the JIRA ID & "android" is the platform affected.
• [ ] Added automated test coverage as appropriate for this change.

We should call remapUri on background thread otherwise it throws IllegalStateException when trying to remap 'cdvfile://localhost/content/...' URIs via ContentFilesystem

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