Moved HTTP semantic conventions to a dedicated topic-based structure

[AlexanderWert]

Part of #137

• created /specification/README.md as a single entry point for all of the semantic conventions (for easier to consumption in the website)
• created specification/http/README.md as an entry point for HTTP semantic conventions
• moved HTTP conventions for spans and metrics to specification/http/
• updated references and links

New structure for HTTP semantic conventions:

┬ specification
├─ README.md
└─ http
    ├─ README.md
    ├─ http-spans.md
    └─ http-metrics.md

[jsuereth]

This LGTM. However, looking at this, I'm curious if maybe we should go after "general" conventions first (or next). WDYT?

[joaopgrassi]

.. I'm curious if maybe we should go after "general" conventions first (or next). WDYT?

Maybe bring "general" ones while bringing the ones that mostly use it? For ex, bring http-general as part of this, since we are moving http conventions which uses the bulk of general attributes?

[joaopgrassi]

It is happening! 🎉

[AlexanderWert]

.. I'm curious if maybe we should go after "general" conventions first (or next). WDYT?

Maybe bring "general" ones while bringing the ones that mostly use it? For ex, bring http-general as part of this, since we are moving http conventions which uses the bulk of general attributes?

@joaopgrassi What do you mean by http-general? I think, we do not have such a thing, yet. Or do you mean moving span-general.md as part of this PR as well because HTTP refers to many attributes from span-general.md?

[AlexanderWert]

I can do general next (tomorrow).

[joaopgrassi]

@AlexanderWert

What do you mean by http-general? I think, we do not have such a thing, yet. Or do you mean moving span-general.md as part of this PR as well because HTTP refers to many attributes from span-general.md?

Yes, sorry, I meant the span-general.md, not sure where I came from with http-general. All good to do it in a follow up :)

[AlexanderWert]

@arminru Can we merge this? There are other PRs depending on this, so merging this would make it easier to review the other PRs.

[reyang]

@arminru Can we merge this? There are other PRs depending on this, so merging this would make it easier to review the other PRs.

+1 - let's move forward.