Split off functional contact tools into its own crate (#5444)

I would like to implement
https://github.com/deltachat/deltachat-core-rust/issues/5422 in its own
crate, but it will depend on some functions that are in the `deltachat`
crate.

So, this PR extracts these functions into its own crate so that I can
add https://github.com/deltachat/deltachat-core-rust/issues/5422 into
the new crate.

deltachat-contact-tools/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "deltachat-contact-tools"
+version = "0.1.0"
+edition = "2021"
+description = "Contact-related tools, like parsing vcards and sanitizing name and address"
+license = "MPL-2.0"
+# TODO maybe it should be called "deltachat-text-utils" or similar?
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = { workspace = true }
+once_cell = { workspace = true }
+regex = { workspace = true }
+rusqlite = { workspace = true } # Needed in order to `impl rusqlite::types::ToSql for EmailAddress`. Could easily be put behind a feature.
+
+[dev-dependencies]
+anyhow = { workspace = true, features = ["backtrace"] } # Enable `backtrace` feature in tests.