[FEATURE] Update PPL anonymizer to anonymize table/index & column/field name

[acarbonetto]

Is your feature request related to a problem?
Anonymizer should hide table/index name and column/field name

Refer to V2 SQL anonymizer updated made in #1665

Related issues:

• [BUG] V2 Query anonymization ignores certain keywords #1687

What solution would you like?
Query:

source=account | where age > 30 | where age < 40 | where balance > 10000 | fields age;
source=online  | fields all_client | sort - all_client | head 1000

Anonymized as:

source=account | where age > *** | where age < *** | where balance > *** | fields + age
source=online | fields + all_client | sort all_client | head 1000 | fields + null

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