Add codec for LTREE type.

[cranst0n]

Adds a codec for the postgresql ltree type.

[tpolecat]

Cool! I will have a look.

[codecov-commenter]

Codecov Report

Merging #544 (d0ff2f4) into main (1c24644) will increase coverage by 0.06%. The diff coverage is 88.88%.

@@            Coverage Diff             @@
##             main     #544      +/-   ##
==========================================
+ Coverage   84.75%   84.81%   +0.06%     
==========================================
  Files         124      126       +2     
  Lines        1692     1719      +27     
  Branches      114      117       +3     
==========================================
+ Hits         1434     1458      +24     
- Misses        258      261       +3     

Impacted Files	Coverage Δ
...odules/core/shared/src/main/scala/data/LTree.scala	86.95% <86.95%> (ø)
.../core/shared/src/main/scala/codec/LTreeCodec.scala	100.00% <100.00%> (ø)

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[ohuu]

Is this PR ready to merge? I'm using ltree in a project