Aaz-dev

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* Update docs for Command Usage and Testing (270)
* Fix bugs while command has no arguments (271)
* Add docs for subcommand generation (272)

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* Add log information for aaz verification (268)

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* Add command `aaz-dev command-model verify` to verify aaz metadata (265)

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* Improve Docs of CLI Generator (258)
* Improve doc display (259)
* [Doc] Add note for examples (260)
* Update generation template for pagination (261)
* Change the initial extension version to 1.0.0b1 (263)

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* Rewrite the workspace editor doc (253)
* Refactor the github page for docs (254)
* Adjust layout for small screen displays. (255)
* Update faq.md (256)

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* Support TimeSchema and TimeArg (250)
* Support `summary` field for swagger operation (249)