Add payloads to identify the template engine used

[righettod]

Hi,

The objectives of this PR are the following:

• Add missing expressions to the existing dictionary template-engines-expression.txt.
• Add a new dictionary with payloads that can be used to identify the template engine used once a evaluation of an expression was identified using the first dictionary.
• Initiate/complete the set of dictionaries for SSTI context in order to enhance the 2 dictionaries over the time and over the type of SSTI discovered during different web pentests.

Sources:

• https://portswigger.net/research/server-side-template-injection
• https://github.com/epinna/tplmap
• Custom personal labs

Thanks in advance 😃

[g0tmi1k]

Thank you! 🎉