Include common XML capabilities pushdown into the product for SQL Server and Postgres

Include the following capabilities out-of-the-box with TDV.

Postgres 9.1 adapter - This allows for push-down to TDV catalog tables when converting Integer timestamp to actual timestamp.

TDV_HOME/conf/adapters/system/postgresql_9_1/postgresql_9_1_values.

<common:attribute xmlns:common="http://www.compositesw.com/services/system/util/common">

<common:name>/custom/TO_TIMESTAMP(~number)</common:name>

<common:type>STRING</common:type>

<common:value>TO_TIMESTAMP($1)</common:value>

<common:configID>TO_TIMESTAMP(~number)</common:configID>

</common:attribute>

SQL Server 2019 adapter - the attached file "microsoft_sql_server_2019_values.xml" contains common XML pushdown configurations for the following capabilities:

LTRIM, RTRIM, INSTR, GREATEST, LEAST, REVERSE, CONTAINS, NVARCHAR