feat(redis): add support for ttl, fix #1666

[sudhackar]

Fixes #1666

Adds a ttl to opendal if SCCACHE_REDIS_TTL env var is set and not zero.

[codecov-commenter]

Codecov Report

Attention: 15 lines in your changes are missing coverage. Please review.

Comparison is base (11703e0) 31.02% compared to head (5ae8e54) 30.74%.

Files	Patch %	Lines
src/config.rs	41.17%	5 Missing and 5 partials ⚠️
src/cache/redis.rs	0.00%	3 Missing ⚠️
src/cache/cache.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2027      +/-   ##
==========================================
- Coverage   31.02%   30.74%   -0.29%     
==========================================
  Files          51       51              
  Lines       19617    19621       +4     
  Branches     9418     9411       -7     
==========================================
- Hits         6087     6032      -55     
- Misses       7874     7882       +8     
- Partials     5656     5707      +51     

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[Xuanwo]

Mostly LGTM, thanks!