fix(getting-started): remove extra comma

[OlivierAlbertini]

Which problem is this PR solving?

• closes Can't run getting-started for the ts-example #703

Short description of the changes

• add ts-node package
• remove extra comma in package.json

[OlivierAlbertini]

ci failed in pg-pool plugin during tsc compile time

[codecov-io]

Codecov Report

Merging #704 into master will increase coverage by 35.04%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master     #704       +/-   ##
===========================================
+ Coverage    55.9%   90.95%   +35.04%     
===========================================
  Files          69      220      +151     
  Lines        1921    10332     +8411     
  Branches      232      951      +719     
===========================================
+ Hits         1074     9397     +8323     
- Misses        847      935       +88

Impacted Files	Coverage Δ
.../opentelemetry-plugin-pg-pool/test/pg-pool.test.ts	88.09% <100%> (ø)
...ges/opentelemetry-core/src/common/ConsoleLogger.ts	90.9% <0%> (-3.21%)	⬇️
...telemetry-core/src/context/propagation/B3Format.ts	95.83% <0%> (-1.31%)	⬇️
...core/src/context/propagation/NoopHttpTextFormat.ts	100% <0%> (ø)	⬆️
packages/opentelemetry-core/src/version.ts	100% <0%> (ø)	⬆️
packages/opentelemetry-core/src/utils/url.ts	100% <0%> (ø)	⬆️
.../opentelemetry-core/src/trace/spancontext-utils.ts	100% <0%> (ø)	⬆️
...ages/opentelemetry-core/src/internal/validators.ts	100% <0%> (ø)	⬆️
...ckages/opentelemetry-core/src/common/NoopLogger.ts	50% <0%> (ø)	⬆️
.../opentelemetry-core/test/metrics/NoopMeter.test.ts	97.22% <0%> (ø)
... and 170 more