Add some more subnet contract tests

[jbencin]

Description

Added some failing tests for the subnet.clar contract. Some examples include:

• Try to register miner twice
• Try to withdraw using invalid root/leaf/sibling hashes
• Try to withdraw to wrong principal
• Try to overflow token balance

Applicable issues

• fixes Test more error cases #219

Additional info (benefits, drawbacks, caveats)

Checklist

• Test coverage for new or modified code paths
• Changelog is updated
• Required documentation changes (e.g., docs/rpc/openapi.yaml and rpc-endpoints.md for v2 endpoints, event-dispatcher.md for new events)
• New clarity functions have corresponding PR in clarity-benchmarking repo
• New integration test(s) added to bitcoin-tests.yml

[codecov-commenter]

Codecov Report

Merging #227 (409b9be) into master (e23b941) will increase coverage by 93.47%.
The diff coverage is 100.00%.

❗ Current head 409b9be differs from pull request most recent head 503844b. Consider uploading reports for the commit 503844b to get more accurate results

@@             Coverage Diff             @@
##           master     #227       +/-   ##
===========================================
+ Coverage        0   93.47%   +93.47%     
===========================================
  Files           0        6        +6     
  Lines           0      337      +337     
===========================================
+ Hits            0      315      +315     
- Misses          0       22       +22     

Impacted Files	Coverage Δ
core-contracts/contracts/helper/simple-ft.clar	76.47% <100.00%> (ø)

... and 5 files with indirect coverage changes

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[obycode]

Before I go through all of the details in subnet_test.ts, could you separate out those new assertions into separate tests, so each one is a separate Clarinet.test? This makes quickly reviewing the results of the test much simpler.

[obycode]

I like the idea of putting a README in here. Let's expand it a bit.

Suggested change

	Essential Clarity contracts for using Stacks Subnets
	This directory contains the contracts published to the Stacks L1 to implement a subnet.
	* _subnet.clar_: interface between the subnet and the L1
	* _multi-miner.clar_: implements a multi-miner for the subnet
	* _helper/*_: used for testing

[jbencin]

I wasn't sure whether to do this or not because it takes a decent amount of setup to get to the point where I can attempt these transactions, but yeah I can make this change

[obycode]

Yeah, I think it's worth it, since these tests don't take long to run.

[jbencin]

It was the code duplication that I wanted to avoid. Anyway, I did split most of my new tests out into separate tests. Also fixed all the remaining deno lint warnings in the subnet_test.ts file

[obycode]

Go ahead and remove the draft status on this when you're ready for a review. Is it ready now?

[obycode]

This is great. Just one minor comment.