feat: port mongodb-core plugin to mongodb #622

[vmarchaud]

Actually most of the code was working with the higher level mongodb driver so i didn't change much code.
I've tested on mongodb version 2, 3.3 and 3.4 and it's working well.

[codecov-io]

Codecov Report

Merging #652 into master will increase coverage by 35.35%.
The diff coverage is 81.81%.

@@             Coverage Diff             @@
##           master     #652       +/-   ##
===========================================
+ Coverage    56.2%   91.55%   +35.35%     
===========================================
  Files          69      215      +146     
  Lines        1943    10192     +8249     
  Branches      236      912      +676     
===========================================
+ Hits         1092     9331     +8239     
- Misses        851      861       +10

Impacted Files	Coverage Δ
packages/opentelemetry-plugin-mongodb/src/types.ts	100% <ø> (ø)
packages/opentelemetry-node/src/config.ts	100% <ø> (ø)
.../opentelemetry-plugin-mongodb/test/mongodb.test.ts	92.64% <ø> (ø)
...ckages/opentelemetry-plugin-mongodb/src/mongodb.ts	93.33% <81.81%> (ø)
...telemetry-core/src/context/propagation/B3Format.ts	94.59% <0%> (-2.55%)	⬇️
...core/src/context/propagation/BinaryTraceContext.ts	96.22% <0%> (-1.82%)	⬇️
...opentelemetry-core/src/trace/globaltracer-utils.ts	100% <0%> (ø)	⬆️
packages/opentelemetry-core/src/utils/url.ts	100% <0%> (ø)	⬆️
.../opentelemetry-core/src/trace/spancontext-utils.ts	100% <0%> (ø)	⬆️
...es/opentelemetry-exporter-collector/test/helper.ts	100% <0%> (ø)	⬆️
... and 167 more

[dyladan]

@vmarchaud please try not to force push on open PRs if possible. It makes it hard to track requested changes because the github UI doesn't associate the conversations with the correct line numbers anymore.

[OlivierAlbertini]

LGTM. Perhaps we should change also:

• https://github.com/open-telemetry/opentelemetry-js/blob/master/packages/opentelemetry-node/src/config.ts#L30
• https://github.com/open-telemetry/opentelemetry-js/blob/master/README.md#node-plugins

[mayurkale22]

I think we should put the deprecated message on existing mongodb-core npm module.

Something like this:

WDYT?

[vmarchaud]

Tests are failling because https://david-dm.org which is used for badges is apparently down, i believe it's safe to merge as-is and maybe fix that in another PR