refactor(sqlite): getter/setter for maxConnections

[timvandam]

Summary of changes

Made SQLiteConnectionPool.maxConnections a protected property, and introduced getters and setters. There is similarly already a getter getActiveConnections(), and the new setter ensures that it is impossible to have more than 1 connection for in-memory databases

Relinquishment of Rights

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[codecov-commenter]

Codecov Report

Merging #393 (f5fb9d1) into master (2e72cff) will increase coverage by 1.11%. The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master     #393      +/-   ##
==========================================
+ Coverage   77.09%   78.20%   +1.11%     
==========================================
  Files         120      169      +49     
  Lines       14824    17746    +2922     
  Branches     4012     4635     +623     
==========================================
+ Hits        11428    13878    +2450     
- Misses       3396     3868     +472     

Impacted Files	Coverage Δ
packages/sqlite/src/sqlite-adapter.ts	94.18% <80.00%> (ø)
packages/mysql/src/mysql-schema-parser.ts	97.14% <0.00%> (ø)
packages/sqlite/src/sqlite-platform.ts	59.83% <0.00%> (ø)
packages/mongo/src/client/client.ts	84.31% <0.00%> (ø)
packages/sqlite/src/sqlite-serializer.ts	100.00% <0.00%> (ø)
packages/mongo/src/client/connection.ts	84.36% <0.00%> (ø)
packages/mongo/src/client/command/dropIndexes.ts	14.28% <0.00%> (ø)
packages/sqlite/src/sql-filter-builder.sqlite.ts	100.00% <0.00%> (ø)
packages/mongo/src/client/command/delete.ts	100.00% <0.00%> (ø)
packages/mysql/src/mysql-platform.ts	100.00% <0.00%> (ø)
... and 40 more

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