Use contextual lambdas to configure batch artefacts

[fmbenhassine]

This request is about improving the builders of item readers and writers to use Lambdas for configuration options:

Current API:

var reader = new FlatFileItemReaderBuilder()
 .resource(...)
 .delimited()
 .delimiter(",")
 .quoteCharacter('"')
 ...
 .build();

Proposal:

var reader = new FlatFileItemReaderBuilder()
 .resource(...)
 .delimited ( config -> config.delimiter(',').quoteCharcter( '"' ))
 ...
 .build();

cc @joshlong