Support prepared statements with connection pooling

[irar2]

Kitura/Swift-Kuery#82

Support prepared statements with connection pooling for PostgreSQL by keeping a set of prepared statements for each connection and creating a prepared statement on the database if necessary

[codecov-io]

Codecov Report

Merging #19 into master will decrease coverage by 1.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master      #19      +/-   ##
==========================================
- Coverage   73.69%   72.68%   -1.02%     
==========================================
  Files           3        3              
  Lines         422      432      +10     
==========================================
+ Hits          311      314       +3     
- Misses        111      118       +7

Flag	Coverage Δ
#SwiftKueryPostgreSQL	72.68% <50%> (-1.02%)	⬇️

Impacted Files	Coverage Δ
...es/SwiftKueryPostgreSQL/PostgreSQLConnection.swift	60.5% <50%> (-1.34%)	⬇️

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[shmuelk]

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