Add support for end-to-end tracing on AWS Lambda

[garrettwegan]

See for example use case: https://github.com/garrettwegan/opentelemetry-lambda/blob/main/go/sample-apps/function/function.go

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ garrettwegan (76a52a1, f0ec58b, f048e4b, 23638fb, 439023e, f7ac5db, e932685, 8c86bb4, debba6c, d481dcb, fedb803, 38a9e91, 6cc43b2, f0b4a7f, 6df424c)

[Aneurysm9]

Both modules require README.md describing their use and the instrumentation should have an example. See other instrumentation for samples.

My remaining comments are aesthetic/conventional and not structural.

[codecov]

Codecov Report

Merging #882 (e2a18cc) into main (d65eb72) will increase coverage by 0.9%.
The diff coverage is 93.1%.

@@           Coverage Diff           @@
##            main    #882     +/-   ##
=======================================
+ Coverage   75.7%   76.6%   +0.9%     
=======================================
  Files         70      75      +5     
  Lines       4467    4685    +218     
=======================================
+ Hits        3382    3592    +210     
- Misses       943     946      +3     
- Partials     142     147      +5     

Impacted Files	Coverage Δ
.../github.com/aws/aws-lambda-go/otellambda/lambda.go	88.6% <88.6%> (ø)
.../aws/aws-lambda-go/otellambda/wrapLambdaHandler.go	92.0% <92.0%> (ø)
detectors/aws/lambda/detector.go	100.0% <100.0%> (ø)
.../github.com/aws/aws-lambda-go/otellambda/config.go	100.0% <100.0%> (ø)
...ub.com/aws/aws-lambda-go/otellambda/wrapHandler.go	100.0% <100.0%> (ø)
... and 1 more

[willarmiros]

From the AWS X-Ray team, generally lgtm, just a couple questions!

[willarmiros]

@bhautikpip would you mind taking a quick look from AWS side as well?

@open-telemetry/go-approvers would anyone else also be able to give this a look and get it merged? Many of the files changed are examples/documentation, and we would love to release this to OTel Go users!

[garrettwegan]

@jmacd and @MrAlias I think both of y'all checked out the links to my PR's in the SIG last week, if either of y'all have had a chance to look them over a bit I'd love some feedback

[bhautikpip]

LGTM :)

[garrettwegan]

Closing in favor of #983, @bhautikpip will own related PRs going forward