[Feature] Span query in PPL should accept timezone parameter

What is the bug?

The date histogram aggregation in query DSL has a timezone parameter, which convert the time value to the specified zone and then do the aggregation, but for now the span query in PPL doesn't have similar parameter, so the aggregation result may not meet the user's expectation.

For instance, in the Discover page of OSD, the timezone is local(read from the browser) by default, so when executing query DSL, the time_zone parameter is set explicitly in the date histogram aggregation, so the aggregation result is different from the result of PPL.

How can one reproduce the bug?
Steps to reproduce the behavior:

1. Go to 'Discover' in OSD
2. Execute DQL, see the histogram result

3. Switch to PPL, check the histogram result

What is the expected behavior?
Span in PPL support the timezone parameter, then pass it to date histogram aggregation when converting to query DSL.

What is your host/environment?
OpenSearch 3.0

• Plugins

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Do you have any additional context?
Add any other context about the problem.

Start at the PPL span query path and compare it with the query DSL date histogram timezone parameter. Reproduce the mismatch in Discover using DQL and PPL, then verify that a timezone supplied to Span reaches the date histogram aggregation and aligns both histogram results.