[pkg/ottl] Update contexts so that all time fields Getters return `time.Time` and Setters take `time.Time`

[TylerHelmuth]

OTTL contexts are updated so that all time fields Getters return time.Time and Setters take time.Time. The accessor names should be updated to drop the time precision (_nano).

Context and fields that need updating:

• ottldatapoint
  • start_time_unix_nano
  • time_unix_nano
• ottllog
  • time_unix_nano
  • observed_time_unix_nano
• ottlspan
  • start_time_unix_nano
  • end_time_unix_nano
• ottlspanevent
  • time_unix_nano

Will also need to update all the cache accessors to be able to handle getting and setting time.Time and time.Duration. Instead of getting and setting a pcommon.Map it should be expressed as a map[string]string.

[ptimofee]

Just hit this with newly introduced in 0.81.0 Time() converter when wanted to convert some fields from k8s events to Timestamp to send event logs to ElasticSearch

      transform:
        error_mode: ignore
        log_statements:
        - context: log
          statements:
          - set(time_unix_nano, Time(body["object"]["eventTime"], "%Y-%m-%dT%H:%M:%SZ")) where body["object"]["eventTime"] != nil
          - set(time_unix_nano, Time(body["object"]["deprecatedLastTimestamp"], "%Y-%m-%dT%H:%M:%SZ")) where body["object"]["deprecatedLastTimestamp"] != nil

Looking forward to it!

[TylerHelmuth]

@ptimofee FYI the Unix nano paths haven't been updated to accept Times yet, they still expect integers. See the main tracking issue for progress on tying all this together.

[TylerHelmuth]

Nevermind, I see we are on the issue asking for this capability. Yes, we're working towards it.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• pkg/ottl: @TylerHelmuth @kentquirk @bogdandrutu @evan-bradley

See Adding Labels via Comments if you do not have permissions to add labels yourself.