feat: adjust WAL purge default configurations

[killme2008]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

Close #5106

What's changed and what's your intention?

Adjust the default value of WAL purge configuration.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.82%. Comparing base (2b699e7) to head (a87ea06).
Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5107      +/-   ##
==========================================
- Coverage   84.02%   83.82%   -0.21%     
==========================================
  Files        1162     1167       +5     
  Lines      216740   217331     +591     
==========================================
+ Hits       182122   182172      +50     
- Misses      34618    35159     +541     

[evenyag]

We may need to run TSBS to see if the default options can cause regression

[killme2008]

We may need to run TSBS to see if the default options can cause regression

Can we quickly benchmark writing based on this branch?

[evenyag]

We may need to run TSBS to see if the default options can cause regression

Can we quickly benchmark writing based on this branch?

The performance impact is small under TSBS.

Before

Summary:
loaded 1036800000 metrics in 278.533sec with 6 workers (mean rate 3722357.59 metrics/sec)
loaded 103680000 rows in 278.533sec with 6 workers (mean rate 372235.76 rows/sec)

Summary:
loaded 1036800000 metrics in 276.704sec with 6 workers (mean rate 3746967.42 metrics/sec)
loaded 103680000 rows in 276.704sec with 6 workers (mean rate 374696.74 rows/sec)

After

Summary:
loaded 1036800000 metrics in 281.590sec with 6 workers (mean rate 3681954.22 metrics/sec)
loaded 103680000 rows in 281.590sec with 6 workers (mean rate 368195.42 rows/sec)


Summary:
loaded 1036800000 metrics in 278.871sec with 6 workers (mean rate 3717847.60 metrics/sec)
loaded 103680000 rows in 278.871sec with 6 workers (mean rate 371784.76 rows/sec)


Summary:
loaded 1036800000 metrics in 275.096sec with 6 workers (mean rate 3768864.60 metrics/sec)
loaded 103680000 rows in 275.096sec with 6 workers (mean rate 376886.46 rows/sec)

This reduces the WAL size during running TSBS (4.8 G -> 1.3 ~ 1.5 G).