fix: map LRO errors to library exception types

[busunkim96]

Fixes #15 🦕

Errors raised by long running operations are currently always type GoogleAPICallError. Use the status code to create a more specific exception type.

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[tseaver]

@googlebot I fixed it.

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[tseaver]

@googlebot I fixed it.

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[tseaver]

@busunkim96 I have no idea what the CLA bot is on about.

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