Improve Error logging of unresolved variables

[tarunKoyalwar]

Please describe your feature request:

• nuclei by default skips requests whose variables are not resolvable (i.e variable value is not given/empty) while this is good it creates lot of noise whenever nuclei is run in versbose mode

Describe the use case of this feature:

• nuclei at the end of scan should log no of requests skipped due to unresolved variables Ref:https://github.com/projectdiscovery/nuclei/issues/3384
• add option to toggle unresolved variables logging in verbose mode

Possible Bug

Investigate if variables are evaluated before/after parsing request

[WRN] [bdsmlr] Could not execute request for : [self-contained:RUNTIME] failed to parse https://{{user}}.bdsmlr.com in self contained request <- [:RUNTIME] failed to parse url <- parse "https://{{user}}.bdsmlr.com": invalid character "{" in host name

[tarunKoyalwar]

TODO

• [ ] show new counter to indicate skipped/errored requests (Ref: https://github.com/projectdiscovery/nuclei/issues/3630)

[mastercho]

Why this still not implemented?