Make SharedComponents public

[tigrannajaryan]

It is currently internal and only used by OTLP receiver however there are other receivers that need the same functionality (any receiver that implements more than one data type needs this).

We have a duplicate in the contrib repo which is used by some contrib receivers, which is also internal. Any distro that implements a receiver like this is also forced to reimplement the SharedComponent.

I think we can simply make it public in the core and use everywhere (not sure if there is any other reason to keep it internal).

cc @bogdandrutu

[bogdandrutu]

There needs to be an API review, and find the right spot to have that. Maybe "pkg/sharedcomponents"?

[tigrannajaryan]

There needs to be an API review, and find the right spot to have that. Maybe "pkg/sharedcomponents"?

Another possibility: component/componenthelper.

[RuoyuDai]

There needs to be an API review, and find the right spot to have that. Maybe "pkg/sharedcomponents"?

Move from internal/sharedcomponent into component/sharedcomponent ?