String search improvements

[Rot127]

• [x] Faster search for - https://github.com/rizinorg/rizin/pull/5383:
  • [x] Foreign endian Unicode encodings (swap bytes, then normal search).
  • [x] Miss-aligned (move bytes to alignment, normal search).
• [x] Document search module architecture.
• [x] Document string search performance differences - https://github.com/rizinorg/rizin/pull/5391
• [x] Support to search multiple encodings with a single search collection. - https://github.com/rizinorg/rizin/pull/5378
• [x] Remove debaseb64 option (in extra PR due to project version increment) - https://github.com/rizinorg/rizin/issues/5361
• [x] Rename some variables for clarity - https://github.com/rizinorg/rizin/pull/5364
• [x] Remove match_inverse - https://github.com/rizinorg/rizin/pull/5363
• [x] Remove RZ_STRING_ENC_BASE64 - https://github.com/rizinorg/rizin/pull/5362
• [x] Armenian search fails on s390x - https://github.com/rizinorg/rizin/issues/5369
• [ ] Faster search for one byte EBCDIC and IBM encodings.
  • [ ] We would just need to convert the characters in the regex to the corresponding bytes and do a regex byte search.