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[Impeller] Implement blit passes for mip-mapping and texture copies. #105148

@chinmaygarde

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@chinmaygarde

We need these passes for both performance and to unblock features like #104718.

On the performance front, high L1 cache miss rates will be addressed by using mip-mapping (which is currently unsupported). The screenshot from the following trace:

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    P2Important issues not at the top of the work liste: impellerImpeller rendering backend issues and features requestsengineflutter/engine related. See also e: labels.

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