Implement adaptive polling for streams

[Stephan-Thomas]

Adaptive Polling for Account and Transaction Streams

Summary

This PR implements adaptive polling for both streamAccount() and streamTransactions() to improve efficiency and responsiveness.

Previously, both streams used a fixed polling interval regardless of activity. This could lead to unnecessary requests for inactive accounts and delayed updates for highly active accounts. With adaptive polling, intervals now adjust automatically based on recent activity.

Changes

Adaptive Polling

Added adaptive interval management to:

• src/account/streamAccount.ts
• src/transaction/streamTransactions.ts

The stream now tracks consecutive polls without changes and adjusts the polling interval accordingly:

• If activity is detected, the interval decreases (down to minIntervalMs).
• If no activity is detected for a configured number of polls, the interval increases (up to maxIntervalMs).

Configuration

Added optional configuration fields:

{
  minIntervalMs?: number;
  maxIntervalMs?: number;
  adaptiveThreshold?: number;
}

These settings allow consumers to control adaptive polling behavior while preserving existing functionality.

Backward Compatibility

Adaptive polling is optional. Existing implementations that rely on fixed polling intervals continue to work without modification.

Testing

Added test coverage for:

• Interval decreases when activity is detected.
• Interval increases after consecutive inactive polls.
• Minimum interval boundary enforcement.
• Maximum interval boundary enforcement.
• Adaptive threshold behavior.
• Backward compatibility with existing fixed-interval configurations.

Benefits

• Faster updates for active accounts and transaction streams.
• Reduced bandwidth and API usage during inactivity.
• Improved scalability when monitoring large numbers of streams.

Related Issue

Closes #14

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[Just-Bamford]

@Stephan-Thomas write a clear and detailed description for your pull request. and the CI test also fix that