[IMPORTANT] Crate status change

[Taowyoo]

Because of the design change of mbedtls and important bugs found:

• Design changes:
  • https://lists.trustedfirmware.org/archives/list/mbed-tls@lists.trustedfirmware.org/message/RJ7YPNBNWUNW2ICQJ72H2JMKPDKGQOLT/
• Bugs
  • [mbedtls3] TLS 1.3 connection is unstable and sometime break in multi-thread env #301
  • [mbedtls3] mbedlts would breaks the record size limit when sending big record #293
  • The PSA code is not thread-safe Mbed-TLS/mbedtls#3263

We (Fortanix) decided not to use mbedtls for TLS. But we still use it (mbedtls 2.28.X) for crypto and PKI.

As a result, following changes will be made to this repository:

• Yank rust-mbedtls versions based on mbedtls 3.X, which includes 0.10.0 0.11.0 0.11.1
• Yank mbedtls-sys-auto versions based on mbedtls 3.X, which includes 3.5.0-alpha.3+0b3de6f 3.5.0-alpha.2+0b3de6f 3.5.0-alpha.1+0b3de6f 3.4.0
• Yank mbedtls-platform-support versions based on mbedtls 3.X, which includes 0.2.0 0.3.0 0.3.1
• Switch rust-mbedtls default branch to a new branch master based on v0.9 branch (a branch for the latest version of rust-mbedtls that based on C mbedtls 2.28.X)
• Update rust-mbedtls README that we're now in maintenance mode and will only ever support 2.28.x.
• Old master now change name to mbedtls-3