feat(fork): add fork to pop cli

[al3mart]

Adds fork to pop cli.

Initially implemented in two different modules: chain and contract as it might be valuable in the future.
A priori forking a contract might not seem to provide extra value over forking a whole chain as if the chain is host to certain contracts these are brought with the chain' state.

But there might be space for optimizations such that we only pick certain state from certain contracts addresses explicitly provided by the user.

Although the initial path to implementation is forking live chains, I've gone ahead and include the command structure for now as it was not any extra effort.

[al3mart]

could be an Option and if no subcommand is provided to fork default to fork chain

[codecov]

Codecov Report

❌ Patch coverage is 64.51613% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.09%. Comparing base (c85f2a1) to head (2ae6093).

Files with missing lines	Patch %	Lines
crates/pop-cli/src/commands/mod.rs	75.00%	5 Missing ⚠️
crates/pop-cli/src/commands/fork/chain.rs	0.00%	3 Missing ⚠️
crates/pop-cli/src/commands/fork/contract.rs	0.00%	3 Missing ⚠️

@@                Coverage Diff                @@
##           feat/pop-fork     #651      +/-   ##
=================================================
- Coverage          77.10%   77.09%   -0.02%     
=================================================
  Files                109      112       +3     
  Lines              24753    24784      +31     
  Branches           24753    24784      +31     
=================================================
+ Hits               19087    19107      +20     
- Misses              3663     3674      +11     
  Partials            2003     2003              

Files with missing lines	Coverage Δ
crates/pop-cli/src/commands/fork/mod.rs	100.00% <100.00%> (ø)
crates/pop-cli/src/commands/fork/chain.rs	0.00% <0.00%> (ø)
crates/pop-cli/src/commands/fork/contract.rs	0.00% <0.00%> (ø)
crates/pop-cli/src/commands/mod.rs	68.49% <75.00%> (+0.65%)	⬆️

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