feat: event handling in get-starknet

[khanti42]

Description

This PR introduces event handling in get-starknet by implementing a polling mechanism to detect and handle accountsChanged and networkChanged events.

Changes Introduced:

1. Event Polling Added:

   • Implemented a polling mechanism to detect changes in the wallet account's address and network state.
   • The polling ensures the walletAccount object remains in sync with the snap state.

2. Unified Polling Logic:

   • A single polling loop is reused for both accountsChanged and networkChanged event handling.
   • Avoids redundant checks and improves efficiency.

3. Optimized Polling Mechanism:

   • Minimum Delay: Ensures a minimum delay between successive polls to avoid overloading resources.
   • Maximum Timeout: Added a timeout for polling operations to prevent hanging requests.
   • Sequential Execution: Ensures that a new poll does not begin until the previous one has completed.

4. Performance Validation:

   • Tested with 20 browser tabs open concurrently to ensure the mechanism remains reliable and efficient under heavy usage.

Purpose:

This ensure that the walletAccount object address and network are in sync with the snap state. As both events are used in the walletAccount object to ensure this: https://github.com/starknet-io/starknet.js/blob/b15fe2d6aa9a5494c510fcac3d6d34fd7e41bf5c/src/wallet/account.ts#L56

[stanleyyconsensys]

the overall coding look good,
some advice for clean up the code
and some bug/wrong behaviour discovered:

• any handler error will break other handler
• previous address never assign

[sonarcloud]

Quality Gate passed for 'consensys_starknet-snap-starknet-snap'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarcloud]

Quality Gate passed for 'consensys_starknet-snap-wallet-ui'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[stanleyyconsensys]

LGTM, we can have a unit test later on