pkg/param: add correct fsp for duration

[YangKeao]

What problem does this PR solve?

Issue Number: close #48563

Problem Summary:

The TIME parameters will always use us precision.

What is changed and how it works?

Only use us (6) precision when the parameter length is 12.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Release note

Fix the issue that the `TIME` parameters always use the `us` precision.

[codecov]

Codecov Report

Merging #48564 (b931162) into master (6e8df18) will increase coverage by 1.4599%.
Report is 8 commits behind head on master.
The diff coverage is 0.0000%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #48564        +/-   ##
================================================
+ Coverage   71.4008%   72.8607%   +1.4599%     
================================================
  Files          1403       1428        +25     
  Lines        406991     414043      +7052     
================================================
+ Hits         290595     301675     +11080     
+ Misses        96441      93436      -3005     
+ Partials      19955      18932      -1023     

Flag	Coverage Δ
integration	43.2978% <0.0000%> (?)
unit	71.4758% <ø> (+0.0750%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	53.9874% <ø> (ø)
parser	∅ <ø> (∅)
br	48.8330% <ø> (-4.2341%)	⬇️

[YangKeao]

/check-issue-triage-complete

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lcwangchao, xhebox

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-14 01:47:22.659160812 +0000 UTC m=+4127240.246270957: ☑️ agreed by xhebox.
• 2023-11-14 06:41:34.36863345 +0000 UTC m=+4144891.955743597: ☑️ agreed by lcwangchao.