Properly escape string property inputs

[ptitzler]

Closes #3047

Signed-off-by: Patrick Titzler ptitzler@us.ibm.com

What changes were proposed in this pull request?

Escape user-provided property values that are of type string:

How was this pull request tested?

Using the component spec referenced in the original issue, I've specified valid JSON strings as input, such as {"test_dict": 99} and ["array_item_1", "array_item_2"].

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[kiersten-stokes]

Tested several components and strings are properly delimited!