Add useSsl and additional options to MariaDB connection string

[lorthirk]

According to #2681, the commons.db.connection.useSsl option is not honored from the MariaDB connector. This PR fixes it, and it also adds a generic commons.db.connection.additionalOptions to use as a last resort if other options are needed, also in other JdbcConnectionUrlResolvers.

Related Issue
This PR fixes #2681

[codecov]

Codecov Report

Merging #2684 into develop will decrease coverage by 0.15%.
The diff coverage is 12.5%.

@@             Coverage Diff              @@
##             develop   #2684      +/-   ##
============================================
- Coverage      53.76%   53.6%   -0.16%     
+ Complexity      2924    2918       -6     
============================================
  Files           1035    1035              
  Lines          28999   29022      +23     
  Branches        2330    2333       +3     
============================================
- Hits           15591   15557      -34     
- Misses         12338   12397      +59     
+ Partials        1070    1068       -2

Impacted Files	Coverage Δ	Complexity Δ
.../DefaultConfigurableJdbcConnectionUrlResolver.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../commons/jpa/MariaDBJdbcConnectionUrlResolver.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...kapua/commons/setting/system/SystemSettingKey.java	100% <100%> (ø)	0 <0> (ø)	⬇️
.../kapua/commons/jpa/JdbcConnectionUrlResolvers.java	45.45% <20%> (+6.99%)	0 <0> (ø)	⬇️
...kapua/commons/jpa/H2JdbcConnectionUrlResolver.java	70% <33.33%> (-15.72%)	0 <0> (ø)
...pse/kapua/transport/mqtt/MqttClientErrorCodes.java	0% <0%> (-100%)	0% <0%> (-1%)
...ipse/kapua/transport/mqtt/MqttClientException.java	0% <0%> (-28.58%)	0% <0%> (-1%)
...ransport/mqtt/pooling/PooledMqttClientFactory.java	63.33% <0%> (-23.34%)	4% <0%> (-2%)
...a/org/eclipse/kapua/transport/mqtt/MqttClient.java	51.28% <0%> (-11.54%)	12% <0%> (-1%)
...egistry/event/internal/DeviceEventServiceImpl.java	78.72% <0%> (-8.52%)	13% <0%> (ø)
... and 4 more

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