Add To Base91 and From Base91 operations (Resolves #1213)

[rayane-ara]

This PR introduces two new operations, To Base91 and From Base91.

Summary

It resolves issue #1213 by adding support for the Base91 encoding scheme. Base91 is an advanced method for encoding binary data as ASCII characters, producing a more compact string than Base64.

The Node API tests have also been updated to reflect the addition of these two new operations.

Example Input (To Base91)

 !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~

Example Output (To Base91)

PDv+lZ0i@G[53jwP@nNE2i~RR2W<mCLU2<.b+rjBrL1EY7$YaXpz{0::+6`WHabdA8J;L!U6FQbp^]@h#G(Ic,5ph#77&xrmlrjgs@DZ7UB>xQGrL@D4f

Example Input (From Base91)

PDv+lZ0i@G[53jwP@nNE2i~RR2W<mCLU2<.b+rjBrL1EY7$YaXpz{0::+6`WHabdA8J;L!U6FQbp^]@h#G(Ic,5ph#77&xrmlrjgs@DZ7UB>xQGrL@D4f

Example Output (From Base91)

 !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~