BanyanDB: support add group prefix (namespace) for BanyanDB groups.

[wankai123]

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes [Feature] Add group prefix for BanyanDB groups #13440.
• Update the CHANGES log.

[Copilot]

Pull Request Overview

This PR adds namespace support to BanyanDB groups by introducing a configurable prefix for group names. The main purpose is to allow multiple SkyWalking instances to share the same BanyanDB cluster while isolating their data through namespaced group names.

Key changes:

• Added namespace configuration with default value "sw" in BanyanDB storage config
• Updated all metadata registry method calls to use specific methods (findMetricMetadata, findRecordMetadata, findManagementMetadata)
• Modified group name construction to include namespace prefix format: "{namespace}_{group_name}"

Reviewed Changes

Copilot reviewed 22 out of 22 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
BanyanDBStorageConfig.java	Added namespace field with default value "sw" to global configuration
MetadataRegistry.java	Added namespace support to schema metadata and split findMetadata into specific methods
Various DAO files	Updated method calls from generic findMetadata to specific typed methods
AbstractBanyanDBDAO.java	Added queryTraceDebuggable method and made queryTrace private
BanyanDBStorageClient.java	Updated property query methods to use schema-based group resolution
bydb.yml	Added namespace configuration documentation and environment variable
changes.md	Added changelog entry for the new feature

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