templater: add relational operators (`>=`, `>`, `<=`, `<`) #550

Job	Run time
Build binary artifacts (linux-x86_64-musl)	37s
Build binary artifacts (linux-x86_64-gnu)	6m 4s
Build binary artifacts (linux-aarch64-musl)	6m 15s
Build binary artifacts (linux-aarch64-gnu)	6m 7s
Build binary artifacts (macos-x86_64)	8m 58s
Build binary artifacts (macos-aarch64)	5m 40s
Build binary artifacts (win-x86_64)	9m 22s
	43m 3s

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