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Add search for libc binary by leaked function addresses (#2103)

* libcdb: Add option to search by function offsets

When you're able to leak addresses of the libc library, use `libcdb.search_by_symbol_offsets()` to find and download the matching libc library from https://libc.rip.

If there are multiple matches, the user is prompted to select one interactively. The selection can be saved in the code for future executions of the script.

Fixes #1867

* libcdb: Handle multiple results when looking up by hash

Sometimes the same library appears to be indexed multiple times (see 0b52d2e71). Handle that situation by selecting the first in the list, since they should all be identical given the same hash value.

* Update CHANGELOG

* Fix off-by-one when pre-selecting a libc

* Do .json() only once

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Co-authored-by: Arusekk <arek_koz@o2.pl>

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