:warning: Add support for encoding.TextMarshaler

[twz123]

Whenever a type is encountered that implements encoding.TextMarshaler but not encoding/json.Marshaler, assume that it will be encoded as a string.

This is a breaking change, as types that implement TextMarshaler are now handled differently. On the other hand, this probably restores reality for all but the most customized setups, as Go's JSON package will also check for the presence of this interface, and output a JSON string.

[k8s-ci-robot]

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[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 601d830a18f14ade1eee173d2ecf80e4af823d80

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, twz123

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