Add calibration result plotting functions

[paulQM]

Added tools to plot the mixer calibration results.

show_lo_result() and show_if_result() plot the calibration data of the LO leakage and image sideband as well as the chosen calibration parameters: I_0, Q_O, dc_gain and dc_phase.

[github-actions[bot]]

Unit Test Results

412 tests   403 :heavy_check_mark:  48s :stopwatch:     1 suites      9 :zzz:     1 files        0 :x:

Results for commit 91fd4ec9.

:recycle: This comment has been updated with latest results.

[paulQM]

Missing:

• [x] Modify changelog
• [x] Write Readme documentation
• [ ] Docstrings
• [ ] Tests