Fix temporal codecs for years having less than 3 digits

[francesconero]

Hello,

I noticed that the way skunk currently serializes dates doesn't pad the year to 4 digits.

This causes Postgres to interpret LocalDate.of(1, 2, 3) (serialized as 1-02-03) as January 2nd 2003, instead of February 3rd 2001.
It also just raises an error in cases where the year is greater than 12 (because it interprets it as a month).

This fix just pads the year to 4 digits serializing LocalDate.of(1, 2, 3) as 0001-02-03, which Postgres interprets correctly.

[codecov]

Codecov Report

Merging #800 (d412f35) into main (ed21904) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #800   +/-   ##
=======================================
  Coverage   84.95%   84.95%           
=======================================
  Files         126      126           
  Lines        1721     1721           
  Branches      127      125    -2     
=======================================
  Hits         1462     1462           
  Misses        259      259           

Impacted Files	Coverage Δ
...e/shared/src/main/scala/codec/TemporalCodecs.scala	87.27% <100.00%> (ø)

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