cleanup rpc handler

[kvfasil]

What

cleaning up RPC handler.

Why

Why are these changes needed?

How

How do these changes achieve the goal?

Test

How has this been tested? How can a reviewer test it?

Checklist

• I have self-reviewed this PR
• I have added tests that prove the feature works or the fix is effective

[github-actions]

Package	Line Rate	Health
core.main.src.broker.rules	78%	✔
core.main.src.processor	0%	❌
core.sdk.src.processor	9%	❌
core.sdk.src.service.mock_app_gw	0%	❌
device.thunder_ripple_sdk.src	13%	❌
core.main.src.state.cap	42%	❌
core.sdk.src.api.device	76%	✔
core.main.src.service	32%	❌
core.sdk.src.api.firebolt	85%	✔
core.sdk.src.api.observability	57%	➖
core.main.src.bootstrap.extn	0%	❌
core.sdk.src.service.mock_app_gw.appgw	0%	❌
core.sdk.src.utils	60%	➖
core.main.src.firebolt	12%	❌
core.tdk.src.utils	0%	❌
core.sdk.src.framework	64%	➖
core.sdk.src.api	45%	❌
device.thunder_ripple_sdk.src.processors.events	0%	❌
core.main.src.service.extn	25%	❌
core.sdk.src.api.gateway	69%	➖
core.main.src	0%	❌
core.main.src.service.ripple_service	9%	❌
device.mock_device.src	56%	➖
core.main.src.broker.test	90%	✔
device.thunder_ripple_sdk.src.events	4%	❌
device.thunder_ripple_sdk.src.processors	19%	❌
core.sdk.src.manifest	0%	❌
core.main.src.processor.storage	0%	❌
core.sdk.src.service	65%	➖
device.thunder_ripple_sdk.src.client	61%	➖
core.main.src.service.apps	25%	❌
core.sdk.src.extn.client	82%	✔
core.sdk.src.extn.ffi	0%	❌
core.main.src.state	35%	❌
core.sdk.src.extn	76%	✔
core.tdk.src.gateway	100%	✔
device.thunder_ripple_sdk.src.bootstrap	0%	❌
core.sdk.src.api.distributor	29%	❌
core.main.src.broker	69%	➖
core.main.src.utils	30%	❌
core.main.src.firebolt.handlers	11%	❌
core.main.src.broker.thunder	37%	❌
core.sdk.src.api.manifest	74%	➖
core.main.src.bootstrap.manifest	0%	❌
core.main.src.bootstrap	0%	❌
Summary	49% (21607 / 43834)	➖

Minimum allowed line rate is 48%