template-pd: introduce 'template' attribute in sdf #1525

Job	Run time
Freeze Code	14s
rustfmt_check	14s
clippy_check	31s
Checks / Style	42s
Checks / Trailing Whitespace	7s
Checks / Portable Shell	6s
Checks / Gitlint	31s
Build SDK / Build SDK (Linux x86_64)	1m 45s
Build SDK / Build SDK (macOS, all targets)	1m 2s
	5m 12s

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