Consider using fastjson when manipulating json bytes

[vincepri]

This library https://github.com/valyala/fastjson seems interesting when it comes to manipulating json objects, which operates only on bytes. We're performing json manipulation in a number of places, we should try to switch the topology's code first.

/kind cleanup
/assign @fabriziopandini

[vincepri]

/milestone v1.1

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/lifecycle stale

[vincepri]

/lifecycle frozen

[fabriziopandini]

/unassign

[fabriziopandini]

/close

given recent changes in the topology controller this is not relevant anymore

[k8s-ci-robot]

@fabriziopandini: Closing this issue.

In response to this:

/close

given recent changes in the topology controller this is not relevant anymore

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