fix(gno.land): improve test speed

[gfanton]

This PR significantly improves the testing speed of the gno.land integration tests. This is mainly achieved through two changes:

• First, I set an interval between empty blocks greater than 0. Having a duration of 0 between empty blocks overwhelmed the CPU and slowed down the tests considerably.
• Second, I executed the integration tests in parallel. However, due to the current implementation (not sure if it's the VM or something else), it is currently impossible to run two (or more) nodes simultaneously in the same process. To address this, I had to rework the integration tests to spawn nodes in separate processes. I also wanted to maintain a way to run everything in memory and in the same process, so I left the option to run tests sequentially in the same process. This is primarily for debugging purposes, such as using pprof. This also explains why the changes are a bit more complex, as I aimed to maintain both workflows.

As a result of this PR, all the gno.land tests now run on the CI in approximately 3m, compared to about 20m on the master branch.

[Gno2D2]

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Codecov Report

Attention: Patch coverage is 69.38144% with 297 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/integration/testscript_gnoland.go	68.76%	137 Missing and 32 partials ⚠️
gno.land/pkg/integration/process.go	69.59%	59 Missing and 24 partials ⚠️
gno.land/pkg/integration/pkgloader.go	65.68%	26 Missing and 9 partials ⚠️
gno.land/pkg/integration/testscript_seqs.go	0.00%	7 Missing ⚠️
tm2/pkg/bft/config/config.go	0.00%	2 Missing and 1 partial ⚠️

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