Allow tuning loader options

[lucaviolanti]

This addresses #332.

SnakeYaml sets various default limits, and supports overriding these values via LoaderOptions.

This PR enables customisation of these limits, following a similar pattern as #205.

[zarthross]

Thanks for the PR!

[codecov-commenter]

Codecov Report

Base: 87.30% // Head: 89.31% // Increases project coverage by +2.01% 🎉

Coverage data is based on head (8370cc8) compared to base (9df6d5c).
Patch coverage: 63.63% of modified lines in pull request are covered.

❗ Current head 8370cc8 differs from pull request most recent head 65bf5ef. Consider uploading reports for the commit 65bf5ef to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #333      +/-   ##
==========================================
+ Coverage   87.30%   89.31%   +2.01%     
==========================================
  Files           5        5              
  Lines         126      131       +5     
  Branches        9        9              
==========================================
+ Hits          110      117       +7     
+ Misses         16       14       -2     

Impacted Files	Coverage Δ
src/main/scala/io/circe/yaml/Parser.scala	87.50% <63.63%> (-1.60%)	⬇️
src/main/scala/io/circe/yaml/parser/package.scala	50.00% <0.00%> (+12.50%)	⬆️

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[zarthross]

[error] circe-yaml: Failed binary compatibility check against io.circe:circe-yaml_3:0.14.2! Found 1 potential problems
[error]  * static method yamlToJson(org.yaml.snakeyaml.nodes.Node)scala.util.Either in class io.circe.yaml.Parser does not have a correspondent in current version
[error]    filter with: ProblemFilters.exclude[DirectMissingMethodProblem]("io.circe.yaml.Parser.yamlToJson")
[error] stack trace is suppressed; run last mimaReportBinaryIssues for the full output
[error] (mimaReportBinaryIssues) Failed binary compatibility check against io.circe:circe-yaml_3:0.14.2! Found 1 potential problems
[error] Total time: 9 s, completed Nov 18, 2022 4:06:24 PM