-max-response-body-size should be used to limit body download

[nil0x42]

Describe the bug
From now, -max-response-body-size is only used to write a truncated file.
However, IMHO it should be used at network level (only read() up-to -max-response-body-size). So httpx doesn't eat all bandwtidth if input has lot of URLs with multi-GB content.

Doing this would then save CPU-time on -match-regex, and save network bandwitdh overall when max-response-body-size is used

[ehsandeep]

Hi @nil0x42,

Now response-size-to-read will consider user input in bytes to limit response read size, additionally, now you can also control how much data you want to write to file as well with response-size-to-save flag.

As default, both flags are set to default, i.e unlimited.