fix(storage): fix inverted index term_id may conflict between multiple fields

[b41sh]

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Summary

We use the value corresponding to the Term obtained from the FST as the term_id to uniquely identify a Term. However, since our search supports multiple fields, this term_id may conflict between multiple fields, resulting in wrong results. This PR adds a new TermId structure, including the field_id and the term_ordinal field, to uniquely identify a Term and avoid conflicts.

• fixes: #[Link the issue here]

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

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