fix(signature-v4-crt): remove dynamic imports (!)

[kuhe]

closes #5221
closes #5216
closes #5135
related to #2822 (pin)

removes dynamic imports and checks for aws-crt.

This requires users to install and import @aws-sdk/signature-v4-crt explicitly where before they would only have to install it, and is a slightly breaking change, but would greatly improve the experience around bundlers or strict ESM crashing on the dynamic import.

Currently:

npm i @aws-sdk/signature-v4-crt 
# to be found by dynamic import

Proposed in PR:

npm i @aws-sdk/signature-v4-crt
# will not be found dynamically

require("@aws-sdk/signature-v4-crt");
// This import registers the implementation with signature-v4-multi-region and user-agent-node
// without needing peerDependencies or dynamic imports.
// Without this, the CRT implementation is considered to be unavailable.
// The new error message will say this.

[kuhe]

• rewrite S3 ispec to separate browser and Node.js scenarios

[kuhe]

• integ
• e2e
• e2e legacy

[github-actions]

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