Add sqlite support

[karpetrosyan]

Closes #89

This pull request adds basic sqlite3 support for all kinds of serializers and can work on top of either trio or asyncio.

[codecov]

Codecov Report

Merging #92 (626b695) into master (352ba73) will not change coverage.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##            master       #92    +/-   ##
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  Coverage   100.00%   100.00%            
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  Files           27        27            
  Lines         1566      1666   +100     
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Files	Coverage Δ
hishel/_async/_storages.py	100.00% <100.00%> (ø)
tests/_async/test_storages.py	100.00% <100.00%> (ø)
tests/_sync/test_storages.py	100.00% <100.00%> (ø)

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[karpetrosyan]

I've added a section where I've outlined the storage options that can be used in each scenario.

Installing sqlite extra for the asynchronous support of sqlite3 is necessary if you want to use the async version of hishel.

pip install hishel[sqlite]

Hishel uses anysqlite library for the asynchronous sqlite3 support.

Also, you can ass your own sqlite3 connections if you want, like so:

import hishel
import sqlite3

client = hishel.CacheClient(
    storage=hishel.SQLiteStorage(connection=sqlite3.connect("my_db_path", timeout=5))
)