fixes: http_broker bugfixes

[brendanobra]

What

for http_broker:

1. fixed bugs that were 1) not using uri in config 2) only support POST (it now only supports GET, which is all that is needed presently) 3) not using the rules engine 4) general refactor to be a bit more idiomatic/readable

Why

http_broker was not working

How

fixes/improvements implemented

Test

Tested against hw

Checklist

• [ x] I have self-reviewed this PR
• I have added tests that prove the feature works or the fix is effective
  (unit tests will follow time permitting)

[github-actions]

Package	Line Rate	Health
core.sdk.src.utils	53%	➖
core.main.src.firebolt.handlers	8%	❌
core.sdk.src.framework	75%	➖
core.tdk.src.utils	0%	❌
core.main.src.bootstrap.extn	0%	❌
core.main.src.service.apps	47%	➖
core.main.src.processor.storage	0%	❌
core.main.src.broker	43%	➖
core.main.src.service.extn	40%	❌
core.main.src.broker.thunder	54%	➖
core.main.src.service	31%	❌
core.main.src	0%	❌
core.sdk.src.api	78%	✔
core.sdk.src.api.device	77%	✔
core.sdk.src.api.firebolt	78%	✔
core.sdk.src.api.observability	68%	➖
device.thunder.src.bootstrap	0%	❌
core.sdk.src.api.gateway	85%	✔
device.thunder_ripple_sdk.src.client	74%	➖
core.sdk.src.api.distributor	84%	✔
core.main.src.bootstrap.manifest	0%	❌
core.tdk.src.gateway	100%	✔
core.main.src.bootstrap	0%	❌
core.sdk.src.extn	83%	✔
device.thunder.src	0%	❌
core.main.src.utils	29%	❌
device.mock_device.src	52%	➖
device.thunder_ripple_sdk.src.events	4%	❌
device.thunder_ripple_sdk.src.processors.events	0%	❌
core.main.src.state	26%	❌
core.sdk.src.extn.ffi	80%	✔
core.main.src.processor	0%	❌
core.main.src.firebolt	4%	❌
core.main.src.state.cap	44%	➖
device.thunder_ripple_sdk.src.processors	10%	❌
device.thunder_ripple_sdk.src	15%	❌
distributor.general.src	2%	❌
openrpc_validator.src	90%	✔
core.launcher.src.manager	7%	❌
core.sdk.src.extn.client	91%	✔
core.launcher.src	0%	❌
core.sdk.src.api.manifest	91%	✔
device.thunder_ripple_sdk.src.bootstrap	0%	❌
Summary	44% (17930 / 41116)	➖

Minimum allowed line rate is 42%