bigInt comparision (#6097)

* attempt at bigint compare

* bigint compare tests

* better tests

* do not compare float and bigint

* more bigint compare

* add compare bigint to null ??

* ugh didn't realize about <> and = operators

* only compare similar types

* change log

* convert test and caml_obj to RES format

* remove duplication in switch

* rename to @res.doc

* Teach the custom command for ninja to build .res files

The lib is built in a custom way because of... historical reasons and complications left in there.

* remove big change

* inline

* Convert the old test too.

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Co-authored-by: Cristiano Calcagno <cristianoc@users.noreply.github.com>

Author: jmagaram

CHANGELOG.md

@@ -64,6 +64,7 @@ These are only breaking changes for unformatted code.
 - Fix issue where `foo(x,_)` in uncurried mode would generate a curried function https://github.com/rescript-lang/rescript-compiler/pull/6082
 - Fix printing of uncurried application when the lhs is a function definition https://github.com/rescript-lang/rescript-compiler/pull/6084
 - Fix parsing uncurried type starting with path https://github.com/rescript-lang/rescript-compiler/pull/6089
+- Fix bigInt comparison https://github.com/rescript-lang/rescript-compiler/pull/6097
 
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