Optimize FingerprintFilter to directly append to termAttribute, improving performance and reducing memory usage.

[rajat315315]

Description

While going through code, found another small optimization that we can do to improve performance and reduce memory footprint.

lucene/lucene/analysis/common/src/java/org/apache/lucene/analysis/miscellaneous/FingerprintFilter.java

Line 176 in 88f7919

termAttribute.setEmpty().append(sb);

Raising a PR to address the same.