feat: Create a network payload meter

[shivanshuraj1333]

Adds some refactoring on top of #493 which makes it generic and also allows it to be used in the gateway code.

Provides a way for serialization, it could be json or proto
Provides a way to do decoding, it could be otlp (plain upstream marshaling), or signoz (deep marshaling used in billing)

Implements Meter for logs, metrics, traces.

On the new instances of logs, metrics, traces, Size and Count can directly be called without worrying about anything.

But still there are few concerns, since we are deciding to put the module in [signoz-otel-collector](https://github.com/SigNoz/signoz-otel-collector) I am facing below problems:

• I am trying to import the new module (tagged with v0.111.19-68c19db8) but it is causing the go.mod tidy to get updated, we are using old libraries from collector, which is breaking the gateway code.

• This would cause the gateway code to break every time there's a library update in upstream.

• Even if we use this new package only without updating the other packges, it is importing other packages as a requirement mentioned in go.mod the reason gateway is importing new libraries is because of this https://github.com/SigNoz/signoz-otel-collector/pull/495/files#diff-b16c4c76ae88fb01ad12b932f6fa9fa83111a12fe0a996d208618fdfc75eb9f4R5-R10

[grandwizard28]

Closing this as per discussion