Adds additional checks on NUMERIC values before sending them to Cloud Spanner in order to return sensible error messages as soon as possible, and adds documentation on how to handle NUMERIC values with trailing zeros in the fractional part.

Codecov Report

Merging #424 into master will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #424      +/-   ##
============================================
+ Coverage     82.16%   82.18%   +0.01%     
- Complexity     2455     2458       +3     
============================================
  Files           136      136              
  Lines         13589    13599      +10     
  Branches       1307     1310       +3     
============================================
+ Hits          11166    11176      +10     
  Misses         1895     1895              
  Partials        528      528              

Impacted Files	Coverage Δ	Complexity Δ
.../src/main/java/com/google/cloud/spanner/Value.java	87.81% <100.00%> (+0.28%)	63.00 <5.00> (+3.00)

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