Tatsh / niquests-cache / 24652629305

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session: add conditional revalidation and 304 handling

Attach ETag/Last-Modified validators to outbound requests when
cache_control=True and a cached entry exists. Handle 304 Not Modified
by refreshing the entry timestamp and returning the cached response.

Add always_revalidate setting to bypass the TTL cache-hit path so
every request with a cached entry sends a conditional request.

Include If-Modified-Since and If-None-Match in the default ignored
parameters so conditional headers do not affect cache keys.

Remove direct tests of private helpers (_lookup_header,
_attach_validators) and replace them with integration tests through
the public CachedSession/AsyncCachedSession API.

Signed-off-by: Andrew Udvare <audvare@gmail.com>

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