Migrate encoding-base32 to use encoding-core

[05nelsonm]

Part 4 of #36

Migrate the base32 module to utilize the encoding-core module. This is an opportunity to write the Base16 Decoder/Encoder in package io.matthewnelson.encoding.base32 and remove component, then have all the current method bodies simply use it as to not disturb the current APIs and remain backwards compatible.

Related to #29

[05nelsonm]

Note: don't touch current base32 tests. This should serve as a check that the old code is functioning as expected even though the implementation was swapped out.

[05nelsonm]

Need to remember to clean up the old code and use top level values for Base32.Default and Base32.Hex instead of re-creating them every time the old extension functions are called.