Context properties should accept arbitrary data

[gastonfournier]

Describe the feature request

Some SDKs may allow users to include arbitrary data inside context properties. SDKs should only accept strings but we know that's not always the case. Edge should gracefully handle this situation and don't fail, which is the current behavior.

This PR shows one simple example, where adding an integer breaks the behavior of a test: #514

Additionally to integers properties should allow complex objects

Background

No response

Solution suggestions

Just ignoring fields that don't comply with the expected schema should work. Then SDKs should be fixed to send the data properly.

In some situations, like handling integer, it might be possible to do a simple transformation to string, but most of other types will not be that trivial.