HLS: Added delay cleanup old expired ts files

[mapengfei53]

Some player start to play from the first ts file, which might be cleanup.
It's better to delay cleanup the ts files. issues #2999

[winlinvip]

Here, duration is used as the time for scheduled cleaning, which is difficult to understand, and there are too many if-else statements, making it very challenging for future maintenance.

A better solution is to send the task of deleting slice files to an asynchronous worker, which will handle recording the time and performing the cleaning.

It's something like this:

void SrsFragmentWindow::clear_expired(bool delete_files, srs_utime_t delay_time)
{
  for (it = expired_fragments.begin(); it != expired_fragments.end(); ++it) {
    SrsFragment* fragment = *it;
    if (!delete_files) {
      continue;
    }
    
    if (delay_time) {
      err = cleanup_worker->unlink_file(filename);
    } else {
      err = fragment->unlink_file();
    }
    if (err != srs_success) {
      srs_warn("Unlink ts failed, %s", srs_error_desc(err).c_str());
      srs_freep(err);
    }

You can use a global cleanup_worker, which is relatively simple.

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[mapengfei53]

I added an asynchronous clock to handle expired ts files. If you have time, please take a look. Thank you.

TRANS_BY_GPT3

[codecov-commenter]

Codecov Report

Merging #3001 (54852b5) into develop (2b2379d) will decrease coverage by 0.04%.
The diff coverage is 3.77%.

❗ Current head 54852b5 differs from pull request most recent head 895acf2. Consider uploading reports for the commit 895acf2 to get more accurate results

@@             Coverage Diff             @@
##           develop    #3001      +/-   ##
===========================================
- Coverage    56.10%   56.06%   -0.05%     
===========================================
  Files          153      153              
  Lines        57561    57609      +48     
===========================================
+ Hits         32294    32296       +2     
- Misses       25267    25313      +46     

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | |
|---|---|---|
| trunk/src/app/srs_app_config.cpp | 65.38% <0.00%> (-0.18%) | ⬇️ |
| trunk/src/app/srs_app_config.hpp | 100.00% <ø> (ø) | |'

Translated to English while maintaining the markdown structure:

'| trunk/src/app/srs_app_config.hpp | 100.00% <ø> (ø) | |
| trunk/src/app/srs_app_fragment.cpp | 11.90% <0.00%> (-0.30%) | ⬇️ |
| trunk/src/app/srs_app_hls.cpp | 0.00% <0.00%> (ø) | |'

Translated to English while maintaining the markdown structure:

'| trunk/src/app/srs_app_hls.cpp | 0.00% <0.00%> (ø) | |
| trunk/src/app/srs_app_hybrid.cpp | 11.26% <5.88%> (-1.70%) | ⬇️ |

---

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| Δ = absolute <relative> (impact), ø = not affected, ? = missing data |

Translated to English while maintaining the markdown structure:

| Δ = absolute <relative> (impact), ø = not affected, ? = missing data |

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