Feat: file handling

[BastinJafari]

PR checklist

Docs

• [x ] If you added new code; is it self documenting? (all the variable names clear, comments added where appropriate)
• [ ] If you touched existing code; did you refactor existing naming, added comments where necessary?

Tests

• [ ] If your ticket adds new functionality; have you added unit tests to verify behaviour?
• [ ] If your ticket alters user interaction with the UI; have you added integration tests?
• [ ] Do your tests check for every convievable user behabviour? (all behaviours the user can perform)

Typing

• [ ] If you added new code; have you added typing?
• [ ] If you touched existing code; have you improved its typing?

Styling

• [ ] If new styles were created; Did you refactor/add more styles in css-in-js style?

This PR will add the multi-modal-example

┆Issue is synchronized with this Asana task by Unito

[codecov[bot]]

Codecov Report

Merging #301 (4229cf1) into master (9fe1a43) will increase coverage by 4.30%. The diff coverage is 64.92%.

@@            Coverage Diff             @@
##           master     #301      +/-   ##
==========================================
+ Coverage   68.11%   72.42%   +4.30%     
==========================================
  Files          66       67       +1     
  Lines        1540     1592      +52     
  Branches      239      247       +8     
==========================================
+ Hits         1049     1153     +104     
+ Misses        491      439      -52     

Impacted Files	Coverage Δ
src/redux/flows/flows.constants.ts	100.00% <ø> (ø)
src/redux/index.ts	60.00% <ø> (ø)
src/services/tests/gatewayClient.ts	0.00% <0.00%> (ø)
src/redux/logStream/logStream.actions.ts	22.72% <25.00%> (+14.03%)	:arrow_up:
src/services/jinad.ts	37.80% <77.77%> (+18.52%)	:arrow_up:
src/redux/flows/flows.actions.ts	92.22% <90.00%> (+55.18%)	:arrow_up:
src/redux/flows/flows.reducer.ts	87.91% <90.90%> (+2.04%)	:arrow_up:
src/redux/flows/flows.selectors.ts	72.72% <100.00%> (ø)
src/redux/flows/flows.testData.ts	100.00% <100.00%> (ø)
... and 4 more

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