add non-allocating enumerate_paths!

[rafaqz]

This PR adds an in-place version of enumerate_paths - enumerate_paths!, that enumerate_paths now calls itself after making the required allocations.

This can greatly improve performance where you need to call it many times. I also removed allocations in enumerate_paths functions, such as allocations of Vector{Int} where UnitRange works fine in its place.

(This may need a specific test, although it will run in the current tests anyway - I can write that if its considered to be merged)

[rafaqz]

Bump

[Krastanov]

the failures seem to be only in JuliaFormating tests. Do you mind running the formater?

[rafaqz]

Ok, thats done.

I have a few requests:

• please remove the need for approval to run workflows in the github settings
• please, lets remove this formatter check. Formatter could be run by julia-format to make its own PR, instead of blocking contributions without perfect formatting

[Krastanov]

I am not really a core part of the team, so I can not address these requests, but I am in favor of the changes you are requesting. @gdalle , are you a good person to tag on this (see previous comment)?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.31%. Comparing base (2ae1c18) to head (057d7ed).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #428   +/-   ##
=======================================
  Coverage   97.30%   97.31%           
=======================================
  Files         117      117           
  Lines        6948     6962   +14     
=======================================
+ Hits         6761     6775   +14     
  Misses        187      187           

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