Promote IOTHubEndpointStorageContainer and IOTHubFallbackRoute to v1alpha2

[ytsarev]

Description of your changes

This PR promotes IOTHubFallbackRoute and its dependency of IOTHubEndpointStorageContainer to v1alpha2

Caveats:

• Special handling of FallbackRoute/default externalName/id as it is always the same according to

#149 should be merged first

I have:

• Read and followed Crossplane's contribution process.
• Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

k apply -f examples/devices/iothubendpointstoragecontainer.yaml
k get iothubendpointstoragecontainer.devices.azure.jet.crossplane.io/yury-example
NAME           READY   SYNCED   EXTERNAL-NAME   AGE
yury-example   True    True     yury-example    34h
k apply -f examples/devices/iothubfallbackroute.yaml 
NAME           READY   SYNCED   EXTERNAL-NAME   AGE
yury-example   True    True     default         58m

[ytsarev]

@ulucinar thanks a lot for the suggestion, it worked! Please review again

[ulucinar]

@ulucinar thanks a lot for the suggestion, it worked! Please review again

Hi @ytsarev,
Sure thing! I've merged the parent PR. Could you please rebase this PR?

[ytsarev]

@ulucinar rebased, thanks!

[ulucinar]

It's interesting that we have generated this field's serialized name as iothubName but the corresponding ref field's and selector field's serialized names as iotHubNameRef and iotHubNameSelector, respectively.

[ulucinar]

Thank you @ytsarev, very much appreciated :)