Added Title usage to Vectara Destination

[ofermend]

What

*Now an additional configuration field called "title_field" is used to specify which source field would be used as the title of the document in the Vectara side.

• Updated documentation and integration test

CC @flash1293

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Name	Status	Preview	Comments	Updated (UTC)
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[flash1293]

Bumped the version, otherwise this looks good to me. Merging on green CI

CI is running here: #34601