v0.84.8: feat: use IsSupportedFunction instead (#39)

Signed-off-by: clavinjune <[email protected]>

v0.84.7: utils: fix timestamp function validation in IsLikelyInvalid (#55)

Improve timestamp function compatibility with Prometheus.

Align timestamp behavior with Prometheus semantics, where it's treated as a transform function rather than a rollup, allowing usage with non-metric expressions like timestamp(sum(foo)).