feat: cpu and store gas updates

[piux2]

Summary:

This PR updates the CPU and Store gas based on results from the benchmarking tool:#2241

For CPU gas, the measurement is in nanoseconds per opcode execution.
For storage gas, the measurement is in nanoseconds per byte for each type of Gno store access.

Changes:

We moved the gas meter from the underlying store to the upper Gno store to capture accurate resource consumption for VM transactions. At the same time, we retain the original gas store and gas meter for the Auth Keeper to handle regular blockchain transactions that do not necessarily involve the VM.

We also updated the gas-wanted in the integration test to reflect actual gas usage. This can serve as a flag to alert us to future changes that might increase gas assumptions.

Additional reasons for these changes include:

• The Gno VM store processes additional complex encoding and decoding of data structures, rather than simply reading and writing bytes to disk.
• For the above reason, we benchmarked gas for store access at the Gno store level.
• We want to avoid consuming gas at two points for a single store access during a VM transaction.

Here are the diagrams to explain the store access gas before and after changes

Before:

After:

Contributors' checklist...

• Added new tests
• 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

[zivkovicmilos]

I think the PR looks fine, apart from the comments left by @thehowl, which should be addressed about the global gas meter setting in the VM keeper 🙏

I'm temporarily just putting a pause on the PR, to allow for us to discuss whether these new gas values make sense, since they are a huge change. I also want to see some more reasoning and gas comparisons, apart from #2241

If we're fine with the bumps, I am also cool with the PR moving forward as is ✅

cc @moul @notJoon

[moul]

Overall, it looks good. In this PR or a future one, I suggest we:

• Add a global multiplier/divider parameter to avoid using ngnot while keeping the numbers relatively readable.
• Create a benchmarking tool that runs all the gnocode in the repository and generates a CSV or TXT file with the gas details we commit periodically (there's no need for this on every commit, in my opinion). This way, whenever we want to fine-tune a parameter, we can run the same script again and compare the results.

[zivkovicmilos]

Unblocking after @moul is fine with the bumps

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 80.32787% with 12 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/keyscli/addpkg.go	0.00%	4 Missing and 2 partials ⚠️
gnovm/pkg/gnolang/store.go	87.50%	4 Missing and 1 partial ⚠️
tm2/pkg/sdk/auth/keeper.go	80.00%	1 Missing ⚠️

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