Added node.info()

[serg3295]

Fixes #2759

• This PR is for the dev branch rather than for the release branch.
• This PR is compliant with the other contributing guidelines as well (if not, please describe why).
• I have thoroughly tested my contribution.
• The code changes are reflected in the documentation at docs/*.

This PR adds support for the previously missing node.info() method on esp32.

Test code:

function printTable(t) for k, v in pairs(t) do print(k, v) end end

print("\n====== no params:") printTable(node.info())
print("\n====== build config:") printTable(node.info("build_config"))
print("\n====== lfs:") printTable(node.info("lfs"))
print("\n====== hw:") printTable(node.info("hw"))
print("\n====== sw version:") printTable(node.info("sw_version"))

[pjsg]

LGTM