Does Tor project provide a secure drop facility available for interested parties to contact Tor project anonymously (the sender identity) and securely (the content of the message). If such a facility is available, where to find it? If not, is it being considered?
No and No.
And I think the question is irrelevant to the site, since it's not about Tor, the software.
Also, I'm having a hard time picturing why Tor Project would need a 'secure-drop' instance. It's definitely not a news agency and 'secure-drop' isn't a messaging platform. Perhaps the question you want to ask is "How to disclose a bug privately and securely with Tor developers"? in that case, you can send a PGP encrypted email to one of the core developers from a pseudonym email account.
No, Tor project does not provide such service. On the other hand, you can encrypt your email content using OpenPGP encryption, and use a hidden email service (such as mail2tor.com), that enables you to send emails to the clearnet, in order to hide your identity.