ddtrace/tracer: setup GLS-stored context #2714

Job	Run time
Prepare Go modules cache	8s
Smoke Tests	0s
macos-latest (AppSec disabled)	1m 33s
windows-latest (AppSec disabled)	2m 40s
macos-12 go1.22	6m 52s
ubuntu-latest-16-cores (AppSec disabled)	1m 7s
macos-12 go1.21	5m 4s
linux/amd64 golang:1.22-bookworm	1m 19s
macos-14 go1.22	3m 33s
linux/arm64 golang:1.22-bookworm	2m 51s
macos-14 go1.21	3m 24s
linux/amd64 golang:1.22-bullseye	1m 27s
linux/arm64 golang:1.22-bullseye	3m 11s
linux/amd64 golang:1.22-alpine	1m 20s
linux/arm64 golang:1.22-alpine	3m 8s
linux/amd64 golang:1.21-bookworm	1m 19s
linux/arm64 golang:1.21-bookworm	3m 31s
linux/amd64 golang:1.21-bullseye	1m 31s
linux/arm64 golang:1.21-bullseye	3m 16s
linux/amd64 golang:1.21-alpine	1m 28s
linux/arm64 golang:1.21-alpine	2m 59s
	51m 41s

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