Added support for HANDHELD, FLATBED, and BOTH scanner types in simulator

[venkateshrajmendram]

Description of changes:

Added support for multiple simulated scanners (FLATBED, HANDHELD, and BOTH) in simulation mode. Updated simulator configuration and controller to properly route barcode data based on scannerType.

Changes

• Added separate simulated scanner beans for FLATBED and HANDHELD
• Updated ScannerConfig to register both devices in simulation mode
• Updated ScanSimulatorController to route barcode to correct simulator instance
• Added support for /v1/scan/{scannerType} handling

Description of testing:

• Verified local startup in simulation mode
• Verified FLATBED scan works end-to-end
• Verified HANDHELD scan works end-to-end
• Verified BOTH scenario returns correct device based on source
• Verified invalid source handling

Please make sure the following changes have been made before creating a pull request.
Note- The Changes were tested in Swagger as this change pertains to Simulator Scanner API endpoints.
Update Description

• Change tested on actual device
• Changes tested for simulator
• Existing device functionality is working fine
• Unit Tests Written for Code Changes, and Verified that Coverage is 100% for Modified Files(with the exception of ATM devices)

Description	Multi-scanner simulator (FLATBED/HANDHELD/BOTH + simulate endpoints)
	Manual test cases (local)
Tests	Test Case	Desc	Result
1	Startup and Swagger visibility	./gradlew run -DuseSimulators=true	Pass
2	Swagger groups show simulator endpoints		Pass
3	Swagger “simulate” endpoints are POST only		Pass
	End-to-End Scanner Flow test
4	Select: FLATBED as  SCANNER	in Swagger, trigger scan request: GET /v1/scan/{scannerType} with FLATBED Enter data in simualtor, successfully see the data getting to FLATBED	pass
5	Select: HANDHELD as  SCANNER	in Swagger, trigger scan request: GET /v1/scan/{scannerType} with HANDHELD Enter data in simualtor, successfully see the data getting to HANDHELD	pass
6	Select: BOTH as  SCANNER	in Swagger, trigger scan request: GET /v1/scan/{scannerType} with BOTH Enter data in simualtor, successfully see the data getting to FLATBED or HANDHELD	pass

Test screenshots for each ScannerType test case in Swagger are as below.

[venkateshrajmendram]

Addressed minor formatting and renaming. Please take a look.