Added more implementations of priority queue

[czgdp1807]

References to other Issues or PRs or Relevant literature

Closes #131

Brief description of what is fixed or changed

Minor changes have been made to interface of BinomialHeap and DHeap along with adding more implementations.

Other comments

[codecov]

Codecov Report

Merging #205 into master will decrease coverage by 0.047%.
The diff coverage is 100.000%.

@@              Coverage Diff              @@
##            master      #205       +/-   ##
=============================================
- Coverage   96.933%   96.886%   -0.048%     
=============================================
  Files           24        24               
  Lines         1859      1895       +36     
=============================================
+ Hits          1802      1836       +34     
- Misses          57        59        +2     

Impacted Files	Coverage Δ
...datastructs/miscellaneous_data_structures/queue.py	98.666% <100.000%> (-1.334%)	⬇️
pydatastructs/trees/heaps.py	98.351% <100.000%> (+0.018%)	⬆️