feat: Pubsub Framework

[Karthick-Somasundaresan]

What

What does this PR add or remove?

Why

Why are these changes needed?

How

This PR introduces structures that enable extensions to send and receive Pubsub-related requests, responses, and events

Test

I've tested it using test extensions

Checklist

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

[rdkcmf-jenkins]

Blackduck scan failure details

Summary: 0 violations, 0 files pending approval, 2 files pending identification.

• Protex Server Path: /home/blackduck/github/Ripple/279/rdkcentral/Ripple

• Commit: d326813

Report detail: gist

[rdkcmf-jenkins]

Blackduck scan failure details

Summary: 0 violations, 0 files pending approval, 2 files pending identification.

• Protex Server Path: /home/blackduck/github/Ripple/279/rdkcentral/Ripple

• Commit: 3561e55

Report detail: gist

[rdkcmf-jenkins]

WARNING: A Blackduck scan failure has been waived

A prior failure has been upvoted

• Upvote reason: Not a problem

• Commit: 3561e55

[satlead]

This new section of code handles the below expectation for Main's extension client to forward the event between one extension to the other.

Authorization to check whether a given Extension has the authority to send the event to the other extension is defined in the manifest with ExtnSender forward_event checks for the contract permissions. So this code is basically a pass through from and extension to main and then to the actual extension.

We will implement a separate change to just emit events from extension to extension without needing to go through main similar to how we handle the response for requests.

[github-actions]

Package	Line Rate	Health
core.sdk.src.api.device	41%	➖
core.sdk.src	100%	✔
core.sdk.src.api.manifest	31%	➖
device.thunder.src.bootstrap	0%	❌
device.thunder_ripple_sdk.src.processors.events	0%	❌
core.main.src	6%	❌
core.main.src.service	30%	➖
device.thunder_ripple_sdk.src.bootstrap	0%	❌
core.main.src.state	21%	➖
core.sdk.src.utils	48%	➖
core.main.src.firebolt	1%	❌
device.thunder_ripple_sdk.src.client	15%	➖
core.main.src.service.extn	27%	➖
core.sdk.src.extn	38%	➖
core.sdk.src.extn.ffi	24%	➖
core.main.src.utils	13%	➖
core.sdk.src.api	3%	❌
core.main.src.bootstrap.manifest	0%	❌
core.main.src.bootstrap	0%	❌
core.launcher.src	1%	❌
core.main.src.firebolt.handlers	2%	❌
core.tdk.src	100%	✔
core.tdk.src.utils	80%	✔
device.thunder.src	2%	❌
core.sdk.src.api.gateway	32%	➖
distributor.general.src	2%	❌
core.sdk.src.extn.client	9%	❌
core.sdk.src.api.distributor	0%	❌
core.tdk.src.gateway	100%	✔
core.main.src.state.cap	44%	➖
core.sdk.src.api.firebolt	25%	➖
core.main.src.processor	0%	❌
device.thunder_ripple_sdk.src.events	4%	❌
core.launcher.src.manager	7%	❌
core.main.src.processor.storage	0%	❌
device.thunder_ripple_sdk.src.processors	4%	❌
core.main.src.bootstrap.extn	0%	❌
core.sdk.src.framework	67%	➖
core.main.src.service.apps	20%	➖
device.thunder_ripple_sdk.src	14%	➖
Summary	13% (3621 / 26867)	➖

Minimum allowed line rate is 10%

Current coverage:13% exceeds coverage threshold. Coverage threshold will be updated automatically to reflect to the latest coverage when this pr is merged to main branch.