[SPARKNLP-1283] Add remove thinking flag

[DevinTDHa]

Description

This PR adds a flag to remove thinking tags (<think>...</think>) in AutoGGUFModel responses. Users can use setRemoveThinkingTag(tag: String) to set a tag to be removed. The matching regex corresponds to (?s)<$tag>.+?</$tag>.

Motivation and Context

How Has This Been Tested?

new tests passing

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Code improvements with no or little impact
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

[coveralls]

Pull Request Test Coverage Report for Build 18651497810

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

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Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 55.094%

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Totals
Change from base Build 18649965549:	0.0%
Covered Lines:	11833
Relevant Lines:	21478

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💛 - Coveralls