chore: support tag in transform

[shuiyisong]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Add a tag field in the pipeline transform section to specify the tag in the database. tag is not an index concept, and now we've separate tag with inverted index, it's clearer to use a separate field to specify a tag other than an index field. For example:

transform:
  - field: type
    type: string
    index: skipping
    tag: true

This config translates to the below SQL

CREATE TABLE IF NOT EXISTS "xx" (
  -- other columns
  "type" STRING NULL SKIPPING INDEX WITH(granularity = '10240', type = 'BLOOM'),
  TIME INDEX ("time"),
  PRIMARY KEY ("type")
  )
ENGINE=mito
WITH(
  append_mode = 'true'
  )

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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