Update to v1.0.0-RC1

[jmacd]

Description:

To upgrade to 1.0.0-RC1, this:

1. splits the exporter into trace and metric exporters
2. adopts changes in the OTel-Go resource API

Repairs some misleading example code in the tracing example.

Link to tracking Issue:
Fixes #33
Fixes #55

Testing:
Viewed a trace in Lightstep, read the debugging output w/ OTEL_LOG_LEVEL=debug.

Documentation:
none

[codecov-commenter]

Codecov Report

Merging #58 (6eae065) into main (4686d49) will decrease coverage by 0.59%.
The diff coverage is 93.02%.

@@            Coverage Diff             @@
##             main      #58      +/-   ##
==========================================
- Coverage   92.14%   91.54%   -0.60%     
==========================================
  Files           3        3              
  Lines         280      284       +4     
==========================================
+ Hits          258      260       +2     
- Misses         11       12       +1     
- Partials       11       12       +1     

Impacted Files	Coverage Δ
launcher/config.go	89.52% <90.00%> (-0.38%)	⬇️
examples/tracing/trace.go	100.00% <100.00%> (ø)

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