Extended readMapping to columnMapping for jdbc connectors

[pratyakshsharma]

Currently jdbc connectors control how the data should be read using ReadMapping. But the writing is hard coded in JdbcPageSink#appendColumn. Below are some of the requirements which require proper writeMapping and inclusion of write functions with read mapping (or a generic ColumnMapping) -

• Add support for array data type in Postgres - This needs to be mapped as a presto array type as well as presto json type due to certain trade offs
• Add support for how unsupported jdbc type columns should be handled.
• Respect original data type while inserting (needed to support inserting postgres array values when they are mapped to presto json.)
• Also changes are needed to allow inserting into tables when one of the columns has been ignored as part of unsupported type handling.

All this requires us to introduce a new WriteMapping for writing data to storage. ReadMapping needs to be extended into ColumnMapping which will also contain WriteFunctions. A new WriteFunction interface needs to be introduced.

Ref: https://github.com/prestodb/presto/pull/12151

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[pratyakshsharma]

@NikhilCollooru gentle ping!

[pratyakshsharma]

@imjalpreet @agrawalreetika @fgwang7w

Can you guys take the first pass here?

[ethanyzhang]

Can you revisit this? @pratyakshsharma

[pratyakshsharma]

@agrawalreetika Let us revive this?

[pratyakshsharma]

@agrawalreetika I have resolved the conflicts.

[agrawalreetika]

Thank you @pratyakshsharma for raising the PR. I see there are multiple changes done in this PR. Could we break it into feature-wise commits? It would also make it easier to review