Add check to verify if brood dates are of the same year

[StefanVriend]

@zuzulaz commented on the quality check protocol: "Maybe you deal with this already, but as I am not familiar in detail with the checks, I rather ask: is there any check to verify if both dates are from the same year – that there is not any error for example in the year of one of those dates? For example, it might happen that lay date is noted as 10-04-2018 and hatch date as 25-04-2019. This would mean that lay date is earlier – what would meet the assumption, however, there is an error in the hatch/lay year.
The same would apply for the B5 check.
More generally, is there any check to check for the coherence of dates (within the year/population)?"

I first thought of including this in the existing B4 and B5 checks, but now I consider creating a new check that compares the years of LayDate_observed, HatchDate_observed and FledgeDate_observed to BreedingSeason.