Thread local mapped buffers

[dstuebe]

Try using thread local mapped byte buffers in VirtualFilePage

[codecov-io]

Codecov Report

Merging #99 into performance_tests will increase coverage by 0.16%.
The diff coverage is 100%.

@@                   Coverage Diff                   @@
##             performance_tests      #99      +/-   ##
=======================================================
+ Coverage                73.13%   73.29%   +0.16%     
- Complexity                 603      606       +3     
=======================================================
  Files                       55       55              
  Lines                     2371     2374       +3     
  Branches                   182      182              
=======================================================
+ Hits                      1734     1740       +6     
+ Misses                     547      546       -1     
+ Partials                    90       88       -2

Impacted Files	Coverage Δ	Complexity Δ
...java/com/upserve/uppend/blobs/VirtualPageFile.java	82.6% <100%> (+0.83%)	59 <3> (+1)	⬆️
...main/java/com/upserve/uppend/blobs/MappedPage.java	100% <100%> (ø)	4 <1> (ø)	⬇️
...ain/java/com/upserve/uppend/lookup/LookupData.java	90.54% <0%> (+0.67%)	80% <0%> (+2%)	⬆️

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