Convert native module dependencies to N-API

[deepak1556]

We have converted a couple of modules over to n-api for electron 6 upgrade, while there are still a number of them we depend on that needs work. This bug tracks them.

Our Forks:

• node-spdlog
• node-pty
• node-native-watchdog refactor: convert to n-api node-native-watchdog#1
• windows-mutex (Windows)
• windows-process-tree (Windows)

External:

• node-sqlite3
• oniguruma
• nsfw
• keytar

[deepak1556]

No plans to address this.