Add token usage logging and dashboard for inference plugin

[sphilipse]

• Add TokenUsageLogger service that logs token usage to Elasticsearch
• Add handleTokenUsageLogging operator for chat completion pipelines
• Extend Model type with creator, name, and platform fields
• Extend InferenceEndpoint with metadata (display name, creator)
• Install token usage dashboard via saved objects on plugin start
• Thread tokenUsageLogger through inference client creation chain

Summary

Summarize your PR. If it involves visual changes include a screenshot or gif.

Checklist

Check the PR satisfies following conditions.

Reviewers should verify this PR satisfies this list as well.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• This was checked for breaking HTTP API changes, and any breaking changes have been approved by the breaking-change committee. The release_note:breaking label should be applied in these situations.
• Flaky Test Runner was used on any tests changed
• The PR description includes the appropriate Release Notes section, and the correct release_note:* label is applied per the guidelines
• Review the backport guidelines and apply applicable backport:* labels.

Identify risks

Does this PR introduce any risks? For example, consider risks like hard to test bugs, performance regression, potential of data loss.

Describe the risk, its severity, and mitigation for each identified risk. Invite stakeholders and evaluate how to proceed before merging.

• See some risk examples
• ...