(#198) AgileScreen: Show latest fixed and flexible tariffs for comparison

[ryanw-mobile]

The Agile Screen chart is updated to show the latest fixed and flexible tariff unit rates (as line graphs) to highlight when the agile tariff is generally cheaper than both of these tariffs.

A new widget is added as the legend.

This ticket concludes version 1.3.0 (build 8)

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: -0.94% (target: -1.00%)	:white_check_mark: 8.70%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (02934f888bb5631062f4acaca20935bc524ce2e0) | 2092 | 1396 | 66.73% | | | Head commit (418c15a59ef1d17294e7335ea62d579183490284) | 2125 (+33) | 1398 (+2) | 65.79% (**-0.94%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#243) | 46 | 4 | **8.70%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 7.14286% with 39 lines in your changes missing coverage. Please review.

Project coverage is 60.97%. Comparing base (02934f8) to head (418c15a).

Files	Patch %	Lines
...om/rwmobi/kunigami/ui/viewmodels/AgileViewModel.kt	0.00%	38 Missing :warning:
...com/rwmobi/kunigami/domain/model/product/Tariff.kt	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #243 +/- ## ========================================== - Coverage 61.80% 60.97% -0.84% ========================================== Files 103 103 Lines 2008 2037 +29 Branches 322 329 +7 ========================================== + Hits 1241 1242 +1 - Misses 649 676 +27 - Partials 118 119 +1 ```

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