Add 'imsegment' and 'imrankfilter' IP functions.

[joa-quim]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.82927% with 19 lines in your changes missing coverage. Please review.

Project coverage is 86.05%. Comparing base (6c5691e) to head (d96ce4b).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/lepto_funs.jl	75.94%	19 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1646      +/-   ##
==========================================
+ Coverage   85.99%   86.05%   +0.05%     
==========================================
  Files         151      151              
  Lines       21121    21190      +69     
==========================================
+ Hits        18163    18234      +71     
+ Misses       2958     2956       -2     

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