Classes for LSC measurements

[RemDelaporteMathurin]

Instead of working with these large dicts, we should have classes for LSC measurements. In the future this will help us automate the data aquisition from the LSC

Proposed interface:

background_sample = LSCSample(activity=1 * ureg.Bq, name="background)
my_LSC_sample = LSCSample(activity=20 * ureg.Bq, name="a name")

my_LSC_sample.substract_background(background_sample)

For a whole bubbler:

baby_sample_1 = BubblerSample(
    vial_1=LSCSample(activity=20 * ureg.Bq),
    vial_2=LSCSample(activity=0 * ureg.Bq),
    vial_3=LSCSample(activity=12 * ureg.Bq),
    vial_4=LSCSample(activity=1 * ureg.Bq),
    time="SOMEDATEANDTIME",
)

baby_sample_1.substract_background(background_sample)

For a whole run (several bubblers samples):

baby_run_12 = Run(baby_sample_1, baby_sample_2, ...)

baby_run_12.plot(...)
baby_run_12.do_something(...)

[RemDelaporteMathurin]

Completed in #17