Automatically calculate milestone expected ages

[lkeegan]

• uses placeholder algorithm for now
  • calculates average score for a milestone from each age (1 month bins)
  • expected age is the first age with an average score >= 3
  • the details of this algorithm can be refined later
  • resolves #133
• add view data button below expected age slider in admin edit milestone dialog
  • displays a plot of average scores vs age for this milestone
  • includes a dotted line showing the calculated expected age based on the data
• add admin tab for this
  • displays expected age for each milestone & button to plot data
  • button to calculate new expected age for each
  • button to save changes
• add @unovis/ts chart/plotting library
  • using @unovis/ts for now due to lack of svelte 5 support in @unovis/svelte
  • can switch to the svelte version once this issue is resolved
  • svelte-vega looked more promising but gave an error at build time
  • resolves #153
• add numpy to backend dependencies
• remove default constructors from some models to improve generated typescript types
  • e.g. milestones: list[MilestoneAdmin] = {} used to give typescript type MilestoneAdmin[] | undefined
  • replace with milestones: list[MilestoneAdmin] to give MilestoneAdmin[]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 27.91878% with 142 lines in your changes missing coverage. Please review.

Project coverage is 27.85%. Comparing base (43bf1b3) to head (606a49c). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
.../lib/components/Admin/MilestoneExpectedAges.svelte	0.00%	63 Missing and 1 partial :warning:
...src/lib/components/DataDisplay/PlotScoreAge.svelte	0.00%	27 Missing and 1 partial :warning:
...src/lib/components/Admin/EditMilestoneModal.svelte	0.00%	22 Missing and 1 partial :warning:
.../components/Admin/MilestoneExpectedAgeModal.svelte	0.00%	14 Missing and 1 partial :warning:
frontend/src/lib/components/AdminPage.svelte	0.00%	10 Missing and 1 partial :warning:
...rontend/src/lib/components/Admin/SaveButton.svelte	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #157 +/- ## ========================================== - Coverage 27.88% 27.85% -0.04% ========================================== Files 93 96 +3 Lines 3306 3461 +155 Branches 90 93 +3 ========================================== + Hits 922 964 +42 - Misses 2316 2426 +110 - Partials 68 71 +3 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud