Fixes additional type required for --isolatedModules compatibility

Fixes an additional type required for --isolatedModules compatibility

Upgrades the repo's Typescript version to 4.3.5 and addresses resulting issues such as compatibility with --isolatedModules. This provides compatibility with more recent versions of Deno.

• Fixes an issue where the throttle ended early with incomplete throughput, if the incoming data rate slows such that the outgoing data must wait.

• Fixes issues when passing requests through an unbounded throttle (bytesPerSecond = Infinity).
• Adds public onThroughputMetrics metrics callback to the BandwidthThrottleGroup.

• Fixes issues on subsequent throttled requests in a group.
• Improved resilience for readerToDenoReader util.

• Initial Node.js / Deno release