Add ruleset packs, linter, fixtures, and JSON schema

rulesets/timestamps.toml

@@ -0,0 +1,19 @@
+[[rule]]
+id = "NON_MONOTONOUS_DTS"
+domain = "timestamp"
+severity = "medium"
+confidence = 0.6
+fix_tier = "remux"
+stop_scan = false
+patterns = ["(?i)Non-monotonous DTS", "(?i)non monotonically increasing dts"]
+notes = "Timestamp discontinuity detected."
+
+[[rule]]
+id = "DTS_DISCONTINUITY"
+domain = "timestamp"
+severity = "medium"
+confidence = 0.6
+fix_tier = "remux"
+stop_scan = false
+patterns = ["(?i)DTS discontinuity"]
+notes = "Timestamp discontinuity detected."