ddtrace/tracer: setup GLS-stored context #2713

Job	Run time
Prepare Go modules cache	58s
Smoke Tests	0s
macos-latest (AppSec disabled)	2m 39s
linux/amd64 golang:1.22-bookworm	1m 29s
windows-latest (AppSec disabled)	2m 59s
macos-12 go1.22	7m 22s
linux/arm64 golang:1.22-bookworm	3m 17s
ubuntu-latest-16-cores (AppSec disabled)	1m 12s
macos-12 go1.21	6m 19s
linux/amd64 golang:1.22-bullseye	1m 18s
linux/arm64 golang:1.22-bullseye	2m 58s
macos-14 go1.22	3m 15s
macos-14 go1.21	3m 31s
linux/amd64 golang:1.22-alpine	1m 18s
linux/arm64 golang:1.22-alpine	3m 9s
linux/amd64 golang:1.21-bookworm	1m 22s
linux/arm64 golang:1.21-bookworm	3m 4s
linux/amd64 golang:1.21-bullseye	1m 38s
linux/arm64 golang:1.21-bullseye	3m 14s
linux/amd64 golang:1.21-alpine	1m 24s
linux/arm64 golang:1.21-alpine	3m 24s
	55m 50s

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