Add mc-sgx-panic crate for common panic handling

[nick-mobilecoin]

This change is in preparation of the mc-sgx-sync crate, #29

In order to support Mutex poisoning there needs to be an implementation of panicking(), https://doc.rust-lang.org/src/std/sync/poison.rs.html#33
This panicking logic should probably be common such that it's not re-implemented for mc-sgx-panic-abort and mc-sgx-panic-log

It may be appropriate to only have mc-sgx-panic and then use features abort and log to specify the implementation to use. While features are inherently additive in Cargo it's not unheard of to use mutually exclusive features, https://doc.rust-lang.org/cargo/reference/features.html#mutually-exclusive-features

[nick-mobilecoin]

Current dependencies on/for this PR:

• main
  • PR Update CI for SGX SDK action update #14
    • PR Move panic to panic/abort #13
      • PR Add untrusted side of stderr from enclave #15
        • PR Add mc-sgx-io #22
          • PR Add mc-sgx-panic-log #24
            • PR Add mc-sgx-panic crate for common panic handling #30 👈
              • PR Add panicking::panic_count to mc-sgx-panic #31
                • PR Update CODEOWNERS file #32
                  • PR Add panicking::panicking() function #33
                  • PR Add public function thread::panicking() #34
                  • PR Add mc-sgx-sync crate #35
                  • PR Add poison.rs to mc-sgx-sync crate #36
                  • PR Add sys module to mc-sgx-sync #39
                  • PR Add mutex.rs to mc-sgx-sync crate #40
                  • PR Use a static buffer for panic messages #41
                  • PR Add mc-sgx-sync::sys::locks::Condvar #42
                  • PR Add Condvar to mc-sgx-sync crate #43
                  • PR Add mc-sgx-sync::sys::locks::RwLock #44
                  • PR Add RwLock to mc-sgx-sync #45
                  • PR Add example usage for mc-sgx-sync and std::sync #46
                  • PR Merge panic-abort and panic-log crates into mc-sgx-panic #48
                  • PR Prevent recursive panics from happening #50
                  • PR Remove unneeded traits on sys types #51
        • PR Rename mc-sgx-io to mc-sgx-io-untrusted #21

This comment was auto-generated by Graphite.

[nick-mobilecoin]

Current dependencies on/for this PR:

• main
  • PR Update CI for SGX SDK action update #14
    • PR Move panic to panic/abort #13
      • PR Add untrusted side of stderr from enclave #15
        • PR Add mc-sgx-io #22
          • PR Add mc-sgx-panic-log #24
            • PR Add mc-sgx-panic crate for common panic handling #30 👈
              • PR Add panicking::panic_count to mc-sgx-panic #31
        • PR Rename mc-sgx-io to mc-sgx-io-untrusted #21

This comment was auto-generated by Graphite.

[codecov-commenter]

Codecov Report

Merging #30 (b4249a1) into panic-log (dfb54d8) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##           panic-log      #30      +/-   ##
=============================================
+ Coverage      87.80%   87.90%   +0.09%     
=============================================
  Files              4        5       +1     
  Lines            123      124       +1     
=============================================
+ Hits             108      109       +1     
  Misses            15       15              

Impacted Files	Coverage Δ
panic/src/lib.rs	100.00% <100.00%> (ø)

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[NotGyro]

This looks good, simple introduction of a new crate

[samdealy]

LGTM