config: add support to file:// and http(s):// URIs

[evacchi]

What type of PR is this?

/kind feature

/kind api-change

What this PR does / why we need it:

Extends the current plugin config to use instead a URI. In the case of file:// the behavior is the same as it is currently. In the case of http(s):// it will fetch the URI and try to evaluate it as a wasm payload.

This PR is based on earlier work on dapr/component-contrib. See: https://github.com/dapr/components-contrib/pull/3005

Which issue(s) this PR fixes:

n/a will create if required.

Special notes for your reviewer:

n/a

Does this PR introduce a user-facing change?

Changes `PluginConfig.ConfigPath` to `PluginConfig.ConfigURL`. A local path must now be prefixed with `file://`. A local path will be of the form `file://relativepath/myfile.wasm` or `file:///absolute/path/to/myfile.wasm`.

What are the benchmark results of this change?

n/a

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: evacchi / name: Edoardo Vacchi (4da9ede74b4db348688e50df83575463bd81bedb, af1930a5047dcceccd1674c586219c6f03d52e87, 00d385ff9b2f54c1c2527d0f3866884cd45fee38)
• :white_check_mark: login: sanposhiho / name: Kensei Nakada (af1930a5047dcceccd1674c586219c6f03d52e87)

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: evacchi, sanposhiho

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[codefromthecrypt]

Thanks @evacchi /lgtm

[codefromthecrypt]

/lgtm