Add support for cadence-based uprating (#173)

* chore: Add doc for short-code definition method

* test: Add test for standard uprating

* test: Ensure test fails correctly

* feat: Raise error if not all cadence options are added

* test: Fix test

* chore: Refactor parameter construction for self uprating

* chore: Refactor rounding for param uprating

* feat: Construct cadence options set

* fix: Remove unnecessary print, fix types within cadence options

* fix: Change schema

* feat: Partial first implementation of cadence-related funcs

* feat: find_cadence_start func

* feat: Func to find uprater end year

* fix: Repair function to find last uprating date

* fix: Repair func to find first date to include last piece of hard data

* fix: Redo logic behind first date to move in different implementation direction

* feat: Uprating by cadence

* fix: Add rounding back into cadence-based uprating

* test: Add test for two-year offset

* feat: Add error raising for missing first values in uprater

* feat: Custom effective dates for cadence-based upraters

* test: Ensure malformed effective dates fail

* test: Ensure that malformed cadence dates raise error

* feat: Ensure that interval is properly set

* feat: Support custom intervals

* chore: Changelog

* test: Add two tests to catch structural issues in code

* fix: Uprate against correct value

* fix: Rewrite find_cadence_first to properly handle custom intervals

* fix: Rewrite against datetime

* fix: Merge uprate_by_cadence and construct_cadence_uprater

* fix: Add tests to ensure date is valid format

* fix: Fix monthly test; reformat

* chore: Lint

changelog_entry.yaml

@@ -0,0 +1,4 @@
+- bump: minor
+  changes:
+    added:
+    - Parameters can now be uprated based upon fixed cadences