template-pd: introduce 'template' attribute in sdf #1526

Job	Run time
rustfmt_check	18s
clippy_check	38s
Checks / Gitlint	40s
Freeze Code	17s
Checks / Trailing Whitespace	4s
Checks / Style	36s
Checks / Portable Shell	7s
Build SDK / Build SDK (Linux x86_64)	32m 28s
Build SDK / Build SDK (macOS, all targets)	27m 58s
	1h 3m 6s

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