Update b->ulnu and B mixing measurements

[alekssmolkovic]

This PR adds the following measurements in measurements.yml:

• HFLAV average of the differential branching ratio of $B\to \pi \ell \nu$ from HeavyFlavorAveragingGroup:2022wzx
• combination of measurements of differential branching ratios of $B\to \omega \ell \nu$ and $B\to \rho \ell \nu$, originally done by BPR (Bernlochner:2021rel), and also reported in HFLAV
• latest averages for $S{\psi\phi}$ and $S{\psi K}$ as reported in HFLAV