[Feature Request]: Implement generate to handle flag for writing to file

[rytswd]

🔮 Relevant Command

importer generate

🗂 Language Type

All

🔎 Request Details

Current importer generate implementation is not correct, as it simply updates the file in place.
Instead, importer generate should write to stdout by default, and when a flag is provided such as --out file.txt, it should be written to the provided file.

This would probably require a few flags in the end:

• --out filename: write output to filename
• --overwrite: when used with --out flag, ignore the existing file and overwrite
• --remove-markers: remove Importer markers from the processed content

[rytswd]

importer generate now correctly generates the updated file data to stdout, or to a separate file.
There are a few options that are not yet supported, and thus those need to be tracked separately.
Ref: #35