test!: refactor testnode

[rootulp]

Miscelaneous refactors to testnode while working on #2858 but doesn't actually close that issue. This PR adds more logging to help debug the second scenario alluded to in the original post.

[coderabbitai]

Walkthrough

Walkthrough

The changes across various Go test files involve updating consensus parameters, adjusting maximum transaction and block sizes, and refining the configuration and initialization of test nodes. A new testnode package is introduced, and functions are renamed and updated to reflect new logic, particularly for setting up networks and nodes. Constants for memory sizes are added, and unnecessary code and imports are removed to streamline the testing environment.

Changes

File(s)	Summary
app/test/max_total_blob_size_test.go test/cmd/txsim/cli_test.go x/mint/test/mint_test.go	Updated to use DefaultConsensusParams instead of DefaultParams, affecting consensus parameter configuration. Adjusted maximum transaction and block sizes.
test/util/testnode/app_options.go test/util/testnode/config.go (removals)	Introduced testnode package and KVAppOptions type for managing application options. Removed KVAppOptions struct and related functions in subsequent changes.
test/util/testnode/config.go (additions and renames)	Added constants for memory sizes. Renamed and updated functions to reflect new logic for default configurations and consensus parameters. Removed unnecessary imports.
test/util/testnode/full_node.go	Updated logger initialization and removed unused imports and code related to genesis package.
test/util/testnode/network.go	Added NewNetwork function and helper functions for port management, setting up a single validator network with RPC and gRPC configurations.
test/util/testnode/rpc_client.go	Modified function signatures to include testing.TB parameter, added logging, and replaced cleanup functions.
test/util/testnode/full_node_test.go	Removed unused constant kibibyte from the file.

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[cmwaters]

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