Better way of generating file names

[prabhu]

Currently, file names are generated with a bunch of find and replace, which sometimes interferes with directory names. Eg, if the --reports-dir contains the word depscan, it gets changed to sbom :(

https://github.com/AppThreat/dep-scan/blob/master/depscan/cli.py#L357 https://github.com/AppThreat/dep-scan/blob/master/depscan/cli.py#L289

We need to change this behaviour and have better logic to generate file names per type.