feat: add getJWKSFromFileUri to defaultTokenKeyProvider

[ovsds]

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What changed?

Adds support for file URI in defaultTokenKeyProvider

Why?

Planning to provide easy way as an option to use temporal in datalens OS installation without additional container for JWKS provider.

How did you test it?

Found no tests for surrounding code, can add new test files if needed.

Potential risks

Probably user should be warned in stdout that using static keys is not the best way to go.

Documentation

Nothing in current behaviour is changed, just expanding possible URIs.

Is hotfix candidate?

Definetly no.

[CLAassistant]

All committers have signed the CLA.