Decide on what imports should be provided by compiler

[willemneal]

Currently the preamble to each file imports files from the near-runtime and assemblyscript-json.

This means a project that relies on both. Perhaps near-runtime-ts should have assemblyscript-json as a dependency.

Or all necessary files can be bundled up similarly to how the compiler bundles the std library files with webpack.

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in one week if no further activity occurs. Thank you for your contributions!