fix: typos and bit operations

[QuenKar]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

changes:

• interval typos.
• fix decimal128 and interval bit operations.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.

Refer to a related PR or issue link (optional)

[codecov]

Codecov Report

Merging #2944 (58d83ec) into develop (e35a494) will decrease coverage by 0.49%.
The diff coverage is 82.22%.

❗ Current head 58d83ec differs from pull request most recent head 29a672a. Consider uploading reports for the commit 29a672a to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2944      +/-   ##
===========================================
- Coverage    85.05%   84.57%   -0.49%     
===========================================
  Files          754      754              
  Lines       119742   119784      +42     
===========================================
- Hits        101847   101303     -544     
- Misses       17895    18481     +586     

[fengjiachun]

LGTM