fix: fix the scope of recover()

[deelawn]

High level overview

Addresses #1656. This is meant to bring achieve parity between gno and go's recover functionality. The new tests help to ensure this.

BREAKING CHANGE: this will break any realm code that has relies on the incorrect recover implementation

Changes

For the convenience of the reviewer, here are the categories of changes that have been made:

• the recover function has been modified to determine whether a panic can be recovered; this is based on both the "level" of nested defer statements and the frame from which the panic was initiated
• Frames are now stored as pointers to avoid copying frame values as they are tracked by the Exceptions that have been thrown
• a new Exception type has been defined to encapsulate both the panic string and the frame in which it was initiated
• the machine has two new "scope" member variables for tracking levels of panic and defer
• added safety mechanisms to retrieving frames because we may not always want it to panic when trying to retrieve a call frame at an index that exceeds the stack depth
• the gno standard library's testing package's Recover function no longer works as intended; the tests have been modified to achieve the intended behavior
• various new file tests have been added to ensure recover behaves as expected in certain edge cases

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.60%. Comparing base (6afab42) to head (0571ff5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1672      +/-   ##
==========================================
+ Coverage   44.84%   47.60%   +2.75%     
==========================================
  Files         459      389      -70     
  Lines       67625    61641    -5984     
==========================================
- Hits        30329    29344     -985     
+ Misses      34756    29846    -4910     
+ Partials     2540     2451      -89     

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[deelawn]

converted to draft while I address some issues brought up in the comments

[zivkovicmilos]

Looks good 💯

Thank you for resolving this issue 🙏

I've pinged @petar-dambovaliev to give another sanity check, otherwise we're good to go