allow for new map-like functions

[MarcMush]

the @showprogress macro doesn't check anymore if functions are in a predefined list of allowed functions, instead, ncalls should be defined for the used function. This allows to add new map-like function, for example tmap:

using ThreadTools, ProgressMeter

ProgressMeter.ncalls(::typeof(tmap), ::Function, args...) = ProgressMeter.ncalls_map(args...)
ProgressMeter.ncalls(::typeof(tmap), ::Function, ::Int, args...) = ProgressMeter.ncalls_map(args...)

@showprogress tmap(abs2, 1:10^5)
@showprogress tmap(abs2, 4, 1:10^5)

fix #144, fix #251

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (65d049e) 96.81% compared to head (6a339e0) 96.79%.
Report is 3 commits behind head on master.

Files	Patch %	Lines
src/ProgressMeter.jl	93.10%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #296      +/-   ##
==========================================
- Coverage   96.81%   96.79%   -0.02%     
==========================================
  Files           1        1              
  Lines         533      530       -3     
==========================================
- Hits          516      513       -3     
  Misses         17       17              

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