[pkg/ottl] Support string to boolean conversion.

[danelson]

Component(s)

pkg/ottl

Is your feature request related to a problem? Please describe.

Original discussion in https://cloud-native.slack.com/archives/C01N6P7KR6W/p1764961932853649.

I would like to be able to convert some boolean like strings to booleans. Something that improves the following

transform/string_to_boolean:
  log_statements:
    - statements:
      - set(log.attributes["my.attribute"], true) where ToLowerCase(log.attributes["my.attribute"]) == "true"
      - set(log.attributes["my.attribute"], false) where ToLowerCase(log.attributes["my.attribute"]) == "false"

Describe the solution you'd like

A function such as ParseBool which takes inspiration from ParseInt. It could work on non string objects as well. The syntax could look like

transform/boolean:
  log_statements:
    - statements:
      - set(log.attributes(["my.attribute"]), ParseBool(log.attributes["my.attribute"])

for my string specific case I would expect something like

transform/boolean:
  log_statements:
    - statements:
      - set(log.attributes(["my.attribute"]), ParseBool(log.attributes["my.attribute"]) where IsString(log.attributes["my.attribute"])

Describe alternatives you've considered

No response

Additional context

If this is something the maintainers feel like supporting I can contribute a PR

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[github-actions]

Pinging code owners:

• pkg/ottl: @TylerHelmuth @evan-bradley @edmocosta

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