Adding sum support for annotated queries

[trande4884]

Description

This PR is to add sum() support for annotated queries in azure-spring-data-cosmos. For performance reasons, columns being used for sum() should be indexed.

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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[FabianMeiswinkel]

LGTM - Please update the PR description and address the NIt comment I left. The PR description should probably call out that it is critical (perf-wise) to have the columns summed or used for filters being indexed.

[kushagraThapar]

LGTM @trande4884 thanks!
Please also update the readme section with the indexing part required for sum queries otherwise it will be a performance issue.

[azure-sdk]

API change check

APIView has identified API level changes in this PR and created following API reviews.

com.azure:azure-spring-data-cosmos

[trande4884]

/azp run java - spring - cosmos - tests

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