Manually acknowledge take

[mdrago98]

Description

The following change adds a version of take which would allow the user to manually control when the batch is acknowledged. This would be useful for certain applications where we would need to reprocess the un acknowledged messages if the batch fails.

We also added a change to the setup prometheus sensors function which would check the name for naming consistencies with prometheus.

Refer to #189

[taybin]

I need to take a closer look at this, but a public facing API like this definitely needs one or more unittests.

[codecov-commenter]

Codecov Report

Merging #192 (3c92bbc) into master (835f37e) will decrease coverage by 0.46%.
The diff coverage is 1.81%.

@@            Coverage Diff             @@
##           master     #192      +/-   ##
==========================================
- Coverage   94.51%   94.04%   -0.47%     
==========================================
  Files         100      100              
  Lines       10631    10685      +54     
  Branches     1202     1207       +5     
==========================================
+ Hits        10048    10049       +1     
- Misses        514      567      +53     
  Partials       69       69              

Impacted Files	Coverage Δ
faust/sensors/prometheus.py	92.85% <0.00%> (-2.94%)	⬇️
faust/streams.py	89.79% <2.08%> (-9.75%)	⬇️

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[patkivikram]

Could you add unit tests?