Extract indexed_db crate to a separate repository

[laruh]

We have a well-developed Rust representation of the IndexedDB API https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API, with low-level wrappers over essential JavaScript structures. I propose moving this implementation into a separate repository and publishing it on crates.io as komodo-idb-rs.

Currently there is limited number of up-to-date and complete libraries for IndexedDB in rust. Publishing komodo-idb-rs is a good opportunity for us to take a significant place in the open-source IndexedDB ecosystem for rust.