refactor: retrieve cache handler kv instance inside constructor

[james-elicx]

Context

At the moment, the KV instance that is used by the cache handler is assigned to the class as a static property as part of the code patch that happens. We should move this to happen during the creation of a new instance of the class.

Normally, all logic related to setting up the cache handler would happen within the cache handler itself, whereas it currently happens externally. This also means that in the long-term, it makes it easier to extend the cache handler to support additional mechanisms/customisability should we desire (e.g. R2).

Changes

• Moves the cache handler to the templates dir and builds it to the output directory in the cli with an inlined env var for the name of the KV binding.
• Changes the patch to import the cache handler from the output directory instead of the cli.
• Retrieves KV instance in constructor.

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Latest commit: 0dbf79c10f0ad7bf0f59be31de708c56ba175269

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| Name | Type | | ---------------------- | ----- | | @opennextjs/cloudflare | Patch |

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