feat(lib-transfer-manager): add @aws-sdk/lib-transfer-manager as private package

[smilkuri]

Description

This is a work in progress high level library to interact with S3 which provides support for multipart upload using worker threads.

Testing

$ yarn test:e2e

 Test Files  1 passed (1)
      Tests  26 passed (26)
   Start at  16:16:36
   Duration  277.44s (transform 188ms, setup 0ms, import 370ms, tests 276.94s, environment 0ms)

Checklist

• If the PR is a feature, add integration tests (*.integ.spec.ts) or E2E tests.
  • It's not a feature.
• My E2E tests are resilient to concurrent i/o.
  • I didn't write any E2E tests.
• I added access level annotations e.g. @public, @internal tags and enabled doc generation on the package. Remember that access level annotations go below the description, not above.
  • I didn't add any public functions.
• Streams - how do they work?? My WebStream readers/locks are properly lifecycled. Node.js stream backpressure is handled. Error handling.
  • No streams here.

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[kuhe]

rather than file level replacements, create a separate index.browser.ts file.

main: dist-cjs/index.js
browser: dist-es/index.browser.js
module: dist-es/index.browser.js
react-native: dist-es/index.native.js

[smilkuri]

For this we need to duplicate S3TransferManager.ts into S3TransferManager.browser.ts and replace join-streams and worker-http-handler browser variants in the imports. Is it worth duplicating the code?

[kuhe]

use dependency injection binding like in https://github.com/smithy-lang/smithy-typescript/blob/main/packages/core/src/submodules/serde/index.browser.ts

export class Uint8ArrayBlobAdapter extends bindUint8ArrayBlobAdapter(toUtf8, fromUtf8, toBase64, fromBase64) {}

[kuhe]

we can do this in a later PR