Add ability to automatically dump all memory of a process on Linux

[medioxor]

hey all, i noted that when doing a default dump of a remote linux process only the stack of the current thread is captured but not anything else and so i've found that i have had to manually enumerate all the memory mappings for a given process and call https://docs.rs/minidump-writer/latest/minidump_writer/minidump_writer/struct.MinidumpWriter.html#method.set_app_memory in order for them to be dumped, i know this makes sense but i was curious if it would be desirable to automate this process as apart of the crate? similar to how you can choose a full minidump when dumping a remote process on windows? i'd be happy to submit a PR if interested

[gabrielesvelto]

We could definitely add a flag to dump all memory. If you have a PR implementing this I'll be happy to review it.

[medioxor]

Awesome! i'll submit it later this week