ConstantTimeEq proc macro derive

[varsha888]

Motivation

Fixes #280
Using Subtle crate
Implemented ConstantTimeEq using proc macro derive
Implemented ConstantTimeGreater and ConstantTimeLesser

Future Work

Move proc macro into subtle crate

[codecov]

Codecov Report

Merging #302 (4586c32) into main (8767447) will increase coverage by 2.25%.
The diff coverage is 98.49%.

@@            Coverage Diff             @@
##             main     #302      +/-   ##
==========================================
+ Coverage   88.24%   90.50%   +2.25%     
==========================================
  Files          47       48       +1     
  Lines        4466     5611    +1145     
==========================================
+ Hits         3941     5078    +1137     
- Misses        525      533       +8     

Impacted Files	Coverage Δ
core/build/src/lib.rs	5.55% <0.00%> (-0.40%)	⬇️
core/types/src/key_request.rs	84.66% <94.59%> (+4.50%)	⬆️
constant_time_derive/src/lib.rs	96.55% <96.55%> (ø)
dcap/types/src/certification_data.rs	97.08% <99.05%> (+0.74%)	⬆️
core/types/src/attestation_key.rs	98.54% <100.00%> (+1.53%)	⬆️
core/types/src/attributes.rs	79.38% <100.00%> (+4.07%)	⬆️
core/types/src/config_id.rs	100.00% <100.00%> (ø)
core/types/src/measurement.rs	100.00% <100.00%> (ø)
core/types/src/quote.rs	100.00% <100.00%> (+0.82%)	⬆️
core/types/src/report.rs	100.00% <100.00%> (ø)
... and 7 more

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[github-actions]

❌ Unreviewed dependencies found

Crate	Version	Reviews (N/2)	LoC	Left-Pad Index	Geiger	Flags
yare	1.0.2	0	89	13	0	____
static_assertions	1.1.0	0	243	174	0	____
subtle	2.4.1	0	377	149	3	____
displaydoc	0.2.3	0	409	65	24	____
serial_test	2.0.0	0	768	44	0	____
cargo-emit	0.2.1	0	824	10	0	____
rand_core	0.6.4	0	829	162	2	____
tempfile	3.5.0	0	927	110	46	____
sha2	0.10.6	0	1061	111	204	____
getrandom	0.2.9	0	1073	140	235	____
once_cell	1.17.1	0	1101	139	139	____
quote	1.0.26	0	1431	135	0	CB__
bitflags	2.1.0	0	2035	95	0	____
textwrap	0.16.0	0	2234	77	0	____
p256	0.13.1	0	2545	22	0	____
proc-macro2	1.0.56	0	3696	86	18	CB__
rand	0.8.5	0	5273	62	32	____
nom	7.1.3	0	10471	33	40	____
bindgen	0.65.1	0	21304	15	405	CB__
syn	1.0.109	0	37583	28	74	CB__
libc	0.2.141	0	97569	16	525	CB__

[nick-mobilecoin]

submitting without specific approval/denial since I'll be awol for the next couple of weeks

[nick-mobilecoin]

The main thing that should be done is mapping the == to Choice in the enum derive logic.
the other stuff is mainly nits and suggestions

[nick-mobilecoin]

closing due to shifting focus