Add llm_methods metadata to multimethod PTE export #1889

Job	Run time
test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job	18m 50s
test-arm / test-backend-linux (arm_tosa_fp, models) / linux-job	25m 46s
test-arm / test-backend-linux (arm_vgf_fp, operators) / linux-job	19m 29s
test-arm / test-backend-linux (arm_vgf_fp, models) / linux-job	26m 50s
test-arm / test-backend-macos	0s
test-arm / package-golden-artifacts	46s
	1h 31m 41s

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