Add ReadBatch() API

[embano1]

Adds ReadBatch() to Log to support use cases with batching, e.g. HTTP/REST APIs.
Instead of returning []Record this API uses the io.Reader pattern of providing (and reusing) a slice to reduce pressure on the GC.

Closes: #5
Signed-off-by: Michael Gasch [email protected]

[codecov-commenter]

Codecov Report

Merging #16 (7520232) into main (2217871) will increase coverage by 0.82%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
+ Coverage   88.88%   89.71%   +0.82%     
==========================================
  Files           4        4              
  Lines         162      175      +13     
==========================================
+ Hits          144      157      +13     
  Misses         11       11              
  Partials        7        7              

Impacted Files	Coverage Δ
memlog.go	84.90% <100.00%> (+2.10%)	⬆️

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