feat(inputs.opcua): Discover nodes by browse-path glob patterns

[skartikey]

Summary

Adds browse-based node discovery for the OPC-UA input plugins, allowing users to specify glob patterns over browse paths instead of enumerating every node explicitly. This is the first of several PRs implementing the feature proposed in #18529; this one targets inputs.opcua. A follow-up PR will wire the same infrastructure into inputs.opcua_listener.

Pattern syntax

• * -> single segment (or any chars within a segment)
• ** -> recursive descent (zero or more segments)
• ? -> single character
• [abc] -> character class
• \ -> escape

Example

[inputs.opcua.browse]
  root = "ns=0;i=85"
  depth = 10

  [[inputs.opcua.browse.paths]]
    pattern = "Objects/Plant1/*/MV*"
    name = "motor_valves"

    [inputs.opcua.browse.paths.default_tags]
      plant = "plant1"

Checklist

• No AI generated code was used in this PR
• AI generated code used in this PR follows the InfluxData Policy on AI-Generated Code Contributions

Related issues

resolves #

[telegraf-tiger]

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