Move opentelemetry crate into a directory to flatten the workspace

[djc]

This makes working with cargo easier, because many commands (like cargo
check, cargo test) will apply to all crates by default, rather than
only selecting the crate in the top-level directory.

[jtescher]

Should probably move the changelog in as well as each crate has their own

[djc]

So the new meta job is failing without a clear error message. It looks like it can no longer find protoc, maybe? @jtescher, any ideas?

[jtescher]

@djc the opentelemetry crate was the default before, think adding -p opentelemetry should fix the tests

[codecov]

Codecov Report

Merging #324 into master will increase coverage by 12.30%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #324       +/-   ##
===========================================
+ Coverage   41.11%   53.42%   +12.30%     
===========================================
  Files          73       71        -2     
  Lines        8615     5758     -2857     
===========================================
- Hits         3542     3076      -466     
+ Misses       5073     2682     -2391     

Impacted Files	Coverage Δ
opentelemetry/src/api/baggage.rs	80.00% <ø> (ø)
opentelemetry/src/api/context.rs	71.42% <ø> (ø)
opentelemetry/src/api/core.rs	58.24% <ø> (ø)
opentelemetry/src/api/labels/encoder.rs	0.00% <ø> (ø)
opentelemetry/src/api/labels/mod.rs	0.00% <ø> (ø)
opentelemetry/src/api/metrics/async_instrument.rs	0.00% <ø> (ø)
opentelemetry/src/api/metrics/config.rs	31.57% <ø> (ø)
opentelemetry/src/api/metrics/descriptor.rs	30.23% <ø> (ø)
opentelemetry/src/api/metrics/kind.rs	5.26% <ø> (ø)
opentelemetry/src/api/metrics/meter.rs	0.00% <ø> (ø)
... and 64 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2574dd5...8b759a6. Read the comment docs.

[jtescher]

LGTM, @djc still working on things? or is this ready to be merged.

[djc]

Nope, I'm happy!