fix(util-endpoints): augment endpointFunctions inline in endpointResolver functions

[kuhe]

Issue

Related to #5925
#5889
#5435

Description

This changes the way we register awsEndpointFunctions. Instead of calling

import "@aws-sdk/util-endpoints";

We will do this in each individual client's endpointResolver fn:

import { awsEndpointFunctions } from "@aws-sdk/util-endpoints";
import { customEndpointFunctions } from "@smithy/util-endpoints";

export const defaultEndpointResolver = ...

customEndpointFunctions.aws = awsEndpointFunctions;

This aims to work around two issues:

1. react-native (some versions of the metro bundler?) may ignore an import statement like import "@aws-sdk/util-endpoints"; because it looks like it's unused, even though it's being imported for its side-effects.
2. in case @smithy/util-endpoints is duplicated due to multiple versions being depended upon, one of those may not receive the augmentation. By running it inline with the client's code, this ensures that whatever version of @smithy/util-endpoints being used by the client is augmented by the same.

Testing

integration tests cover this, because without the AWS endpoint functions, integration tests will fail, due to being unable to resolve endpoints.

• full codegen
• full build
• unit
• integ

[kuhe]

// endpointResolver.ts (before)
// smithy-typescript generated code
import { EndpointV2, Logger } from "@smithy/types";
import { EndpointParams, resolveEndpoint } from "@smithy/util-endpoints";

import { EndpointParameters } from "./EndpointParameters";
import { ruleSet } from "./ruleset";

export const defaultEndpointResolver = (
  endpointParams: EndpointParameters,
  context: { logger?: Logger } = {}
): EndpointV2 => {
  return resolveEndpoint(ruleSet, {
    endpointParams: endpointParams as EndpointParams,
    logger: context.logger,
  });
};

// endpointResolver.ts (after)
// smithy-typescript generated code
import { awsEndpointFunctions } from "@aws-sdk/util-endpoints";
import { EndpointV2, Logger } from "@smithy/types";
import { customEndpointFunctions, EndpointParams, resolveEndpoint } from "@smithy/util-endpoints";

import { EndpointParameters } from "./EndpointParameters";
import { ruleSet } from "./ruleset";

export const defaultEndpointResolver = (
  endpointParams: EndpointParameters,
  context: { logger?: Logger } = {}
): EndpointV2 => {
  return resolveEndpoint(ruleSet, {
    endpointParams: endpointParams as EndpointParams,
    logger: context.logger,
  });
};

customEndpointFunctions.aws = awsEndpointFunctions;

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