[feature] Reverse Shells

[KCarretto]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[codecov]

Codecov Report

Attention: Patch coverage is 15.18738% with 430 lines in your changes are missing coverage. Please review.

Project coverage is 69.25%. Comparing base (69a5492) to head (634e751).

Files	Patch %	Lines
tavern/internal/c2/api_reverse_shell.go	0.00%	137 Missing ⚠️
...eldritch/src/runtime/messages/reverse_shell_pty.rs	0.00%	111 Missing ⚠️
implants/lib/transport/src/grpc.rs	0.00%	49 Missing ⚠️
implants/lib/pb/src/generated/c2.rs	0.00%	40 Missing ⚠️
tavern/internal/ent/schema/shell.go	50.00%	22 Missing ⚠️
tavern/config.go	55.55%	8 Missing and 4 partials ⚠️
tavern/internal/graphql/query.resolvers.go	0.00%	12 Missing ⚠️
tavern/internal/http/endpoint.go	0.00%	12 Missing ⚠️
tavern/internal/ent/schema/beacon.go	0.00%	8 Missing ⚠️
implants/lib/transport/src/mock.rs	0.00%	6 Missing ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #699      +/-   ##
==========================================
- Coverage   71.65%   69.25%   -2.41%     
==========================================
  Files         175      179       +4     
  Lines       12287    12774     +487     
==========================================
+ Hits         8804     8846      +42     
- Misses       3268     3701     +433     
- Partials      215      227      +12     

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