feat: add timeout as a parameter of clients

[leynier]

This feature is for evicting the use of the default timeout of httpx. Resolve #72

[codecov]

Codecov Report

Merging #75 (22fd941) into master (7897d97) will increase coverage by 0.03%.
The diff coverage is 88.23%.

@@            Coverage Diff             @@
##           master      #75      +/-   ##
==========================================
+ Coverage   88.59%   88.62%   +0.03%     
==========================================
  Files          21       21              
  Lines         684      686       +2     
==========================================
+ Hits          606      608       +2     
  Misses         78       78              

Impacted Files	Coverage Δ
postgrest_py/_async/client.py	73.52% <83.33%> (ø)
postgrest_py/_sync/client.py	73.52% <83.33%> (ø)
postgrest_py/__init__.py	100.00% <100.00%> (ø)
postgrest_py/base_client.py	91.66% <100.00%> (+0.36%)	⬆️

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[sourcery-ai]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.97%.

Quality metrics	Before	After	Change
Complexity	0.28 ⭐	0.28 ⭐	0.00
Method Length	19.19 ⭐	20.54 ⭐	1.35 👎
Working memory	4.42 ⭐	4.72 ⭐	0.30 👎
Quality	93.22% ⭐	92.25% ⭐	-0.97% 👎

Other metrics	Before	After	Change
Lines	178	222	44

Changed files	Quality Before	Quality After	Quality Change
postgrest_py/init.py	94.51% ⭐	94.18% ⭐	-0.33% 👎
postgrest_py/base_client.py	90.52% ⭐	90.01% ⭐	-0.51% 👎
postgrest_py/_async/client.py	94.01% ⭐	92.94% ⭐	-1.07% 👎
postgrest_py/_sync/client.py	94.05% ⭐	92.98% ⭐	-1.07% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation

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