Configure typescript tests

[Bassel17]

What does it do?

• Configures jest to be able to run Typescript test files for the data-transfer package

Why is it needed?

• we want to be able to run unit tests when we are working on the package, the package is a typescript package

How to test it?

create a typescript test file and add a test, and run the yarn test:unit the file would be run properly

[codecov[bot]]

Codecov Report

Base: 58.71% // Head: 62.45% // Increases project coverage by +3.73% :tada:

Coverage data is based on head (a41528f) compared to base (8978415). Patch coverage: 75.80% of modified lines in pull request are covered.

:exclamation: Current head a41528f differs from pull request most recent head b315b4f. Consider uploading reports for the commit b315b4f to get more accurate results

Additional details and impacted files

@@                Coverage Diff                 @@
##           features/deits   #14669      +/-   ##
==================================================
+ Coverage           58.71%   62.45%   +3.73%     
==================================================
  Files                1321     1043     -278     
  Lines               31976    22336    -9640     
  Branches             5954     3855    -2099     
==================================================
- Hits                18775    13950    -4825     
+ Misses              11341     7372    -3969     
+ Partials             1860     1014     -846     

Flag	Coverage Δ
front	62.45% <75.80%> (+0.04%)	:arrow_up:
unit	?

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

Impacted Files	Coverage Δ
...ges/core/admin/admin/src/core/apis/CustomFields.js	100.00% <ø> (ø)
packages/core/admin/admin/src/pages/App/index.js	68.96% <0.00%> (ø)
...MarketplacePage/components/NpmPackageCard/index.js	94.59% <ø> (ø)
...arketplacePage/components/NpmPackagesGrid/index.js	100.00% <ø> (ø)
...in/admin/src/pages/MarketplacePage/tests/server.js	81.81% <ø> (ø)
...pe-builder/admin/src/components/FormModal/index.js	0.00% <0.00%> (ø)
...nager/components/DynamicTable/CellContent/index.js	48.71% <33.33%> (-1.29%)	:arrow_down:
...ontent-manager/components/SelectOne/SingleValue.js	54.83% <33.33%> (-0.34%)	:arrow_down:
...lewares/extendCTBAttributeInitialDataMiddleware.js	88.23% <40.00%> (-8.32%)	:arrow_down:
...e/components/NpmPackageCard/InstallPluginButton.js	88.46% <62.50%> (+0.46%)	:arrow_up:
... and 284 more

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[innerdvations]

LGTM but one request: could you add a little test of something as proof it actually runs tests correctly?

(Update: you've added some in the encryption PR so I'll try that + this and if it works I'm happy)