add support for read-only mode in FileExplorerView

[imanjra]

What changes are proposed in this pull request?

When using the FileExplorerView with read_only flag, display value for the property as an read-only ObjectView as shown below:

How is this patch tested? If it is not, please explain why.

(Details)

Release Notes

Is this a user-facing change that should be mentioned in the release notes?

• No. You can skip the rest of this section.
• Yes. Give a description of this change to be included in the release
  notes for FiftyOne users.

(Details in 1-2 sentences. You can just refer to another PR with a description
if this PR is part of a larger change.)

What areas of FiftyOne does this PR affect?

• App: FiftyOne application changes
• Build: Build and test infrastructure changes
• Core: Core fiftyone Python library changes
• Documentation: FiftyOne documentation changes
• Other

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (e77affa) 15.98% compared to head (6f91cbd) 15.98%.
Report is 1 commits behind head on release/v0.22.1.

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v0.22.1    #3597   +/-   ##
================================================
  Coverage            15.98%   15.98%           
================================================
  Files                  594      594           
  Lines                72858    72855    -3     
  Branches               902      902           
================================================
  Hits                 11643    11643           
+ Misses               61215    61212    -3     

Flag	Coverage Δ
app	15.98% <0.00%> (+<0.01%)	⬆️

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

Files	Coverage Δ
...emaIO/components/FileExplorerView/FileExplorer.tsx	0.00% <0.00%> (ø)
...O/components/FileExplorerView/FileExplorerView.tsx	0.00% <0.00%> (ø)

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