feat(timestreaminfluxdb): add TimestreamInfluxDBDbInstance resource

[chrisns]

Summary

Firstly, thank you for maintaining aws-nuke — it's an incredibly useful
tool and the codebase is a pleasure to contribute to.

This PR adds native support for Amazon Timestream for InfluxDB DB instances
(timestream-influxdb service, CloudFormation type
AWS::TimestreamInfluxDB::DbInstance), which currently has no coverage in
aws-nuke via Cloud Control or native resources.

• Introduces TimestreamInfluxDBDbInstance with List, Remove, Filter,
  and Properties, following the RAM resource-share interface/mock pattern
• Tags are fetched per-instance via ListTagsForResource and exposed as
  tag:KeyName for use in filters
• Filter() skips instances already in DELETED or DELETING state to
  avoid unnecessary API errors
• Includes 4 mock tests covering List (with pagination and tag fetching),
  Filter (table-driven across 4 statuses), Remove, and Properties

[ekristen]

@chrisns thanks for the contribution. My pleasure to continue maintaining the tool. Please address the golangci-lint errors.

[chrisns]

Apologies for missing this — fixed the rangeValCopy gocritic lint error on line 47 by replacing for _, item := range resp.Items with the index pattern (for i := range resp.Items { item := &resp.Items[i]), consistent with the rest of the codebase. All mock tests still pass. Force-pushed to the branch.