Add runtime type validation using runtypes

[broerjuang]

I add runtypes to documenting what is returned to API. So maybe it helps.

• [x] adding runtypes
• [x] add guard on hasQuota and getSchedule

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[pveyes]

cc-ing @resir014 as it's related to #26

[resir014]

@broerjuang @pveyes Let's wait until #34 is merged, since that's the farthest we have with the types. We can focus this PR solely on runtypes validation.

[broerjuang]

@resir014 been rebased it to master and adding just runtypes to this PR.

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[resir014]

@broerjuang ESLint errors, please fix.

[pveyes]

sorry can you wait for #61 & rebase afterwards 🙇

[broerjuang]

rebase it already, and change jakiKuota to string. Since the value still returned from the server. 🙇