Add tests about anyhow and backtrace

[fzyzcjy]

Partially related to fzyzcjy/flutter_rust_bridge#582

[fzyzcjy]

Valgrind errors reproduced using on-stock valgrind:

https://github.com/sunshine-protocol/allo-isolate/runs/8109974892?check_suite_focus=true

Run valgrind --error-exitcode=1 --leak-check=full ./target/debug/examples/containers
==2809== Memcheck, a memory error detector
==2809== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==2809== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==2809== Command: ./target/debug/examples/containers
==2809== 
==2809== Syscall param statx(file_name) points to unaddressable byte(s)
==2809==    at 0x496788E: statx (statx.c:29)
==2809==    by 0x273020: statx (weak.rs:176)
==2809==    by 0x273020: std::sys::unix::fs::try_statx (fs.rs:161)
==2809==    by 0x26A[47](https://github.com/sunshine-protocol/allo-isolate/runs/8109974892?check_suite_focus=true#step:6:48)9: file_attr (fs.rs:955)
==2809==    by 0x26A479: std::fs::File::metadata (fs.rs:550)
==2809==    by 0x1A2651: backtrace::symbolize::gimli::mmap (gimli.rs:138)
==2809==    by 0x1A3DA2: backtrace::symbolize::gimli::elf::<impl backtrace::symbolize::gimli::Mapping>::new (elf.rs:21)
==2809==    by 0x1A2D99: backtrace::symbolize::gimli::Cache::mapping_for_lib (gimli.rs:320)
==2809==    by 0x1A3240: backtrace::symbolize::gimli::resolve::{{closure}} (gimli.rs:354)
==2809==    by 0x1A2982: backtrace::symbolize::gimli::Cache::with_global (gimli.rs:266)
==2809==    by 0x1A30E3: backtrace::symbolize::gimli::resolve (gimli.rs:346)
==2809==    by 0x18FB2A: backtrace::symbolize::resolve_frame_unsynchronized (mod.rs:178)
==2809==    by 0x18F92A: backtrace::symbolize::resolve_frame (mod.rs:105)
==2809==    by 0x199[48](https://github.com/sunshine-protocol/allo-isolate/runs/8109974892?check_suite_focus=true#step:6:49)4: backtrace::capture::Backtrace::resolve (capture.rs:232)
==2809==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==2809== 
==2809== Syscall param statx(buf) points to unaddressable byte(s)
==2809==    at 0x[49](https://github.com/sunshine-protocol/allo-isolate/runs/8109974892?check_suite_focus=true#step:6:50)6788E: statx (statx.c:29)
==2809==    by 0x273020: statx (weak.rs:176)
==2809==    by 0x273020: std::sys::unix::fs::try_statx (fs.rs:161)
==2809==    by 0x26A479: file_attr (fs.rs:955)
==2809==    by 0x26A479: std::fs::File::metadata (fs.rs:5[50](https://github.com/sunshine-protocol/allo-isolate/runs/8109974892?check_suite_focus=true#step:6:51))
==2809==    by 0x1A26[51](https://github.com/sunshine-protocol/allo-isolate/runs/8109974892?check_suite_focus=true#step:6:52): backtrace::symbolize::gimli::mmap (gimli.rs:138)
==2809==    by 0x1A3DA2: backtrace::symbolize::gimli::elf::<impl backtrace::symbolize::gimli::Mapping>::new (elf.rs:21)
==2809==    by 0x1A2D99: backtrace::symbolize::gimli::Cache::mapping_for_lib (gimli.rs:320)
==2809==    by 0x1A3240: backtrace::symbolize::gimli::resolve::{{closure}} (gimli.rs:354)
==2809==    by 0x1A2982: backtrace::symbolize::gimli::Cache::with_global (gimli.rs:266)
==2809==    by 0x1A30E3: backtrace::symbolize::gimli::resolve (gimli.rs:346)
==2809==    by 0x18FB2A: backtrace::symbolize::resolve_frame_unsynchronized (mod.rs:178)
==2809==    by 0x18F92A: backtrace::symbolize::resolve_frame (mod.rs:105)
==2809==    by 0x199484: backtrace::capture::Backtrace::resolve (capture.rs:232)
==2809==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==2809== 
all done!
==2809== 
==2809== HEAP SUMMARY:
==2809==     in use at exit: 45,782,816 bytes in 45,807 blocks
==2809==   total heap usage: 108,896 allocs, 63,089 frees, 72,[57](https://github.com/sunshine-protocol/allo-isolate/runs/8109974892?check_suite_focus=true#step:6:58)8,746 bytes allocated
==2809== 
==[28](https://github.com/sunshine-protocol/allo-isolate/runs/8109974892?check_suite_focus=true#step:6:29)09== LEAK SUMMARY:
==2809==    definitely lost: 0 bytes in 0 blocks
==2809==    indirectly lost: 0 bytes in 0 blocks
==2809==      possibly lost: 0 bytes in 0 blocks
==2809==    still reachable: 45,782,816 bytes in 45,807 blocks
==2809==         suppressed: 0 bytes in 0 blocks
==2809== Reachable blocks (those to which a pointer was found) are not shown.
==2809== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==2809== 
==2809== For lists of detected and suppressed errors, rerun with: -s
==2809== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
Error: Process completed with exit code 1.

[fzyzcjy]

With latest valgrind, no longer have "Syscall param statx(file_name) points to unaddressable byte(s)" error.

[shekohex]

LGTM!