refactor: constructors, update docs

- NewCustomTable -> NewCustom
- NewTableBy -> NewBy
- NewTable -> New

hash.go

@@ -7,9 +7,9 @@ import (
 // A Hash function maps any data to a fixed-length value (in this case, a
 // [uint64]).
 //
-// It is used by the [Table] to evenly distribute values
+// It is used by the [HashTable] to evenly distribute values
 // amongst its slots. A good hash function is uniform, [chaotic], and
-// deterministic. [Table] uses [NewDefaultHash] by default, which is built on
+// deterministic. [HashTable] uses [NewDefaultHash] by default, which is built on
 // [maphash.Comparable].
 //
 // [chaotic]: https://en.wikipedia.org/wiki/Avalanche_effect