feature:Added IntervalTree DataStructure

[komal3120]

References to other Issues or PRs or Relevant literature

Fixes #326

Brief description of what is fixed or changed

Added Interval Tree and following Operations

1. addNode : Add Node
2. searchIntervalOverlap: Find Overlaped Interval
3. printTree : Print Tree
4. delete_node : Delete Node

Other comments

[codecov]

Codecov Report

Merging #337 (200d28f) into master (a21d00e) will decrease coverage by 0.621%.
The diff coverage is 78.899%.

@@              Coverage Diff              @@
##            master      #337       +/-   ##
=============================================
- Coverage   98.550%   97.928%   -0.622%     
=============================================
  Files           25        26        +1     
  Lines         3243      3380      +137     
=============================================
+ Hits          3196      3310      +114     
- Misses          47        70       +23     

Impacted Files	Coverage Δ
pydatastructs/utils/__init__.py	100.000% <ø> (ø)
pydatastructs/utils/misc_util.py	98.830% <ø> (ø)
pydatastructs/trees/intervaltree.py	78.504% <78.504%> (ø)
pydatastructs/trees/__init__.py	100.000% <100.000%> (ø)
...ucts/miscellaneous_data_structures/disjoint_set.py	100.000% <0.000%> (ø)

[czgdp1807]

Are you participating through any open source program? Please mention in the comments below.

[komal3120]

yes I am participating through Swoc

[Smit-create]

@komal3120 I see that you are working on your master branch. It is suggested to create a new branch and make a PR, Refer to this: https://support.atlassian.com/bitbucket-cloud/docs/check-out-a-branch/. You can follow this in your upcoming PRs.

[Smit-create]

@komal3120 Are you still working on this?

[komal3120]

yes

[ainy-123]

I am working on this under GSSoC'21.