added backward oracle matching algorithm

[kunjgit]

Description of Change

-added backward oracle matching algorithm #2298 -fast in practice for very long patterns and small alphabets -preprocessing phase in O(m) time and space complexity -searching phase in O(mn) time complexity -optimal in the average

also added some implemantation of the circular queue

#2301

Checklist

• [x] Added description of change
• [x] Added file name matches File name guidelines
• [x] Added tests and example, test must pass
• [x] Added documentation so that the program is self-explanatory and educational - Doxygen guidelines
• [x] Relevant documentation/comments is changed or added
• [x] PR title follows semantic commit guidelines
• [x] Search previous suggestions before making a new one, as yours may be a duplicate.
• [x] I acknowledge that all my contributions will be made under the project's license.

Notes: