Allow globs (wildcards) in config for tags/fields in enum processor

[sspaink]

Required for all PRs:

• Signed CLA.
• Associated README.md updated.
• Has appropriate unit tests.

Resolve #7184 by allowing globs (wildcards) in config for tags/fields in enum processor.

Example of usage:

With the CPU input plugin loaded and the enum processor configured as below, the output will have the associated mapped number included under the destination tag "glob_test".

[[processors.enum]]
  [[processors.enum.mapping]]
    ## Name of the tag to map
    tag = "*"

    ## Destination tag or field to be used for the mapped value.  By default the
    ## source tag or field is used, overwriting the original value.
    dest = "glob_test"

    ## Table of mappings
    [processors.enum.mapping.value_mappings]
      cpu2 = 2
      cpu3 = 3