Local dynamic provider

Define multiple key-value pairs to generate multiple configurations.

For example, the following Elastic Agent policy defines a local dynamic provider that defines three values for item:

inputs:
 - id: logfile-${local_dynamic.my_var}
   type: logfile
   streams:
     - paths: "/var/${local_dynamic.my_var}/app.log"

providers:
  local_dynamic:
    items:
      - vars:
          my_var: key1
      - vars:
          my_var: key2
      - vars:
          my_var: key3

The configuration generated by this policy looks like:

inputs:
 - id: logfile-key1
   type: logfile
   streams:
     - paths: "/var/key1/app.log"
 - id: logfile-key2
   type: logfile
   streams:
     - paths: "/var/key2/app.log"
 - id: logfile-key3
   type: logfile
   streams:
   - paths: "/var/key3/app.log"

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