docs(qa): add large values QA

[glevco]

Motivation

Since the wallet-desktop currently doesn't have automated tests, this PR adds a new QA to make specific checks when handling large output values (BigInt). It introduces a docker compose that runs a complete custom network (full node, tx-mining-service, and CPU miner). The new QA described in QA_LARGE_VALUES.md should be incorporated as part of the QA process for this project.

Acceptance Criteria

• Add new QA_LARGE_VALUES.md.
• Change debug command in README to use equivalent npm script.
• Add new QA npm scripts config.
• Add new QA python script, docker compose, and custom network config files.

Security Checklist

• Make sure you do not include new dependencies in the project unless strictly necessary and do not include dev-dependencies as production ones. More dependencies increase the possibility of one of them being hijacked and affecting us.