feat: allow using UUID in PreparedStatement

[olavloite]

Enables the usage of UUIDs as a parameter in PreparedStatements. UUIDs are automatically translated to strings.

Fixes #364

[codecov]

Codecov Report

Merging #365 (84bba09) into master (2cee011) will decrease coverage by 0.02%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master     #365      +/-   ##
============================================
- Coverage     71.98%   71.96%   -0.03%     
- Complexity     1131     1132       +1     
============================================
  Files            24       24              
  Lines          3520     3524       +4     
  Branches        537      539       +2     
============================================
+ Hits           2534     2536       +2     
- Misses          767      769       +2     
  Partials        219      219              

Impacted Files	Coverage Δ	Complexity Δ
.../google/cloud/spanner/jdbc/JdbcParameterStore.java	50.48% <50.00%> (-0.01%)	128.00 <0.00> (+1.00)	⬇️

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