add watch-diff plugin

[alexmt]

Description

PR adds watch-diff plugin.

Testing

The watch-diff.yaml krew config file was verified manually:

$ kubectl krew install --manifest=plugins/watch-diff.yaml
Installing plugin: watch-diff
Installed plugin: watch-diff
\
 | Use this plugin:
 | 	kubectl watch-diff
 | Documentation:
 | 	https://github.com/alexmt/kubectl-watch-diff
/
$ kubectl watch-diff
Usage: kubectl-watch_diff <resource> <name>

[ahmetb]

🤖 Beep beep! I’m a robot speaking on behalf of @ahmetb. 🤖

---

Thanks for submitting your kubectl plugin to Krew!
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In the meanwhile, here are a few tips to make your plugin manifest better:

• Make sure your plugin follows the best practices.
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Thanks for your patience!
/kind new-plugin

[k8s-ci-robot]

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This pull-request has been approved by: alexmt
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[k8s-ci-robot]

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[alexmt]

Hey! I'm eager to improve this PR and get it merged. Please give your feedback .

[ahmetb]

Hey, looks cool. Any relation to https://github.com/leopoldxx/kube-watch-diff at all? Or ideas you can incorporate from there?