Named Tracers / Tracer Registry (open-telemetry#582)

* feat: spike of named tracer registry

* chore: mysql/mongo tracer registry support

* fix: lint

* chore: add getTracer back

* chore: change default tracer name to empty string

* fix: lint

* chore: update examples for registry

* chore(tracer-registry): make name required

* chore: lint

* chore: update examples for required tracer name

* chore: remove unused tracer delegate

* chore: remove references to basic tracer

* chore: remove references to NodeTracer

* chore: update xhr for tracer registry

* chore: update tracer names to match package names

* chore: add version script to all packages

* chore: update plugins to use version script

* chore: add jsdoc to noop tracer registry

* chore: update ioredis for tracer registry

* chore: update pg pool for tracer registry

* fix: lint

* chore: fix tests

* chore: lint

* chore: lint

Co-authored-by: Mayur Kale <[email protected]>

api/.gitignore

@@ -71,6 +71,7 @@ docs
 
 #lerna
 .changelog
+package.json.lerna_backup
 
 # OS generated files
 .DS_Store