fix webpack build error

[zhex900]

Issue #, if available:

Description of changes:
The reason for this PR is during my electron build, webpack says the AWS CRT module is not found.

aws/aws-iot-device-sdk-js-v2#158

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[bretambrose]

This is a pretty substantial PR (and we definitely appreciate the work put into it) and outside my expertise. Do you have any additional suggestions for evaluating/testing/understanding the work you've done here?

[giantcow]

We might need to rebase since this PR has been open for almost a year now, but IMO the unit tests that haven't run yet should satisfy any testing requirements.

This still actively happens with [email protected] and [email protected]. My project depends on the s3 client (v3) and introduces the aws-crt dependency and webpacking issue:

# kayo @ <snip> in ~/<snip> [1:16:11] C:130
$ npm run webpack -- --stats-error-details

> [email protected] webpack
> webpack "--stats-error-details"

...

WARNING in ./node_modules/aws-crt/dist/native/binding.js 54:18-31
Critical dependency: the request of a dependency is an expression
    at CommonJsRequireContextDependency.getWarnings (/home/kayo/workspace/<snip>/node_modules/webpack/lib/dependencies/ContextDependency.js:91:18)
    at Compilation.reportDependencyErrorsAndWarnings (/home/kayo/workspace/<snip>/node_modules/webpack/lib/Compilation.js:3132:24)
    at /home/kayo/workspace/<snip>/node_modules/webpack/lib/Compilation.js:2729:28
    at _next2 (eval at create (/home/kayo/workspace/<snip>/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:16:1)
    at eval (eval at create (/home/kayo/workspace/<snip>/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:42:1)
    at /home/kayo/workspace/<snip>/node_modules/webpack/lib/FlagDependencyExportsPlugin.js:385:11
    at /home/kayo/workspace/<snip>/node_modules/neo-async/async.js:2830:7
    at Object.each (/home/kayo/workspace/<snip>/node_modules/neo-async/async.js:2850:39)
    at /home/kayo/workspace/<snip>/node_modules/webpack/lib/FlagDependencyExportsPlugin.js:361:18
    at /home/kayo/workspace/<snip>/node_modules/neo-async/async.js:2830:7
 @ ./node_modules/aws-crt/dist/native/crt.js 25:34-54
 @ ./node_modules/aws-crt/dist/index.js 38:25-48
 @ ./node_modules/@aws-sdk/util-user-agent-node/dist-es/is-crt-available.js 3:96-114
 @ ./node_modules/@aws-sdk/util-user-agent-node/dist-es/index.js 5:0-52 16:23-37
 @ ./node_modules/@aws-sdk/client-s3/dist-es/runtimeConfig.js 16:0-65 26:898-914
 @ ./node_modules/@aws-sdk/client-s3/dist-es/S3Client.js 14:0-73 19:24-42
 @ ./node_modules/@aws-sdk/client-s3/dist-es/index.js 2:0-27 2:0-27
 @ ./src/FileManager.ts 37:0-64 116:34-50 148:28-36
 @ ./src/index.ts 49:0-40 76:34-45

...

2 warnings have detailed information that is not shown.
Use 'stats.errorDetails: true' resp. '--stats-error-details' to show it.

webpack 5.72.1 compiled with 2 warnings in 4115 ms

# kayo @ <snip> in ~/<snip> [1:16:04] 
$ npm explain aws-crt
[email protected]
node_modules/aws-crt
  aws-crt@"^1.12.2" from the root project
  aws-crt@"^1.12.2" from @aws-sdk/[email protected]
  node_modules/@aws-sdk/signature-v4-crt
    @aws-sdk/signature-v4-crt@"^3.88.0" from the root project
    peerOptional @aws-sdk/signature-v4-crt@"^3.79.0" from @aws-sdk/[email protected]
    node_modules/@aws-sdk/signature-v4-multi-region
      @aws-sdk/signature-v4-multi-region@"3.88.0" from @aws-sdk/[email protected]
      node_modules/@aws-sdk/client-s3
        @aws-sdk/client-s3@"^3.92.0" from the root project