add concurrency function for expire, exists, ttl, pttl

[iwecon]

These changes are now available in 4.14.0

add concurrency function for expire, exists, ttl, pttl

try await req.redis.expire(key1, after: .seconds(10)) == true 
try await req.redis.exists(key1, key2, key3) == 3
try await req.redis.exists([key1, key2, key3]) == 3
try await req.redis.ttl(key1) == RedisKey.Lifetime
try await req.redis.pttl(key1) == RedisKey.Lifetime

[0xTim]

Thanks!

[codecov]

Codecov Report

❌ Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.09%. Comparing base (d822288) to head (d59664a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
Sources/Redis/RedisClient+Concurrency.swift	0.00%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #222      +/-   ##
==========================================
- Coverage   53.33%   52.09%   -1.25%     
==========================================
  Files          11       12       +1     
  Lines         420      430      +10     
==========================================
  Hits          224      224              
- Misses        196      206      +10     

Files with missing lines	Coverage Δ
Sources/Redis/Redis+Concurrency.swift	0.00% <ø> (ø)
Sources/Redis/RedisClient+Concurrency.swift	0.00% <0.00%> (ø)

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