[chore] Add AGENTS.md file #36843

Job	Run time
setup-environment	13s
checks	2m 14s
govulncheck	3m 15s
lint	14m 52s
unittest-matrix (ubuntu-latest, oldstable)	4m 58s
unittest-matrix (ubuntu-latest, stable)	4m 56s
test-coverage	10m 42s
cross-build-collector (darwin, arm64)	55s
cross-build-collector (linux, 386)	52s
cross-build-collector (windows, arm64)	51s
cross-build-collector (windows, amd64)	56s
cross-build-collector (linux, s390x)	54s
cross-build-collector (windows, 386)	53s
cross-build-collector (linux, arm, 7)	55s
cross-build-collector (linux, arm64)	50s
cross-build-collector (linux, riscv64)	54s
cross-build-collector (aix, ppc64)	1m 1s
cross-build-collector (darwin, amd64)	59s
cross-build-collector (linux, ppc64le)	53s
cross-build-collector (linux, amd64)	52s
unittest	2s
	52m 57s

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