RFC: add signature v4

[AMar4enko]

This is basic implementation for attaching AWS Signature v4 to HttpClientRequest
Usage example is somewhat along these lines:

import { SignatureV4 }  from '@effect-aws/signature-v4/Aws4Fetch.js'
export class ApiClient extends Effect.Service<ApiClient>()(
  `ApiClient`,
  {
    effect: Effect.gen(function* () {
      const { transformClient } = yield* SignatureV4

      return yield* HttpApiClient.make(Api, {
        baseUrl: ApiBaseUrl,
        transformClient,
      })
    }),
  },
) {}

const Sig4 = SignatureV4.Default.pipe(
  Layer.provide(Credentials.layer(awsCreds))
)

const runtime = ManagedRuntime.make(
  Layer.provide(ApiClient),
  Layer.provide(Sig4),
)

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Latest commit: 4c34768317b5ee517a4559f9a75b82b58005728e

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