[DOC] Mention alternative contract SDKs

[frol]

Is your feature request related to a problem? Please describe.

Developers do not know about alternative contract development options, which provide different benefits to them.

Evidence:

• https://t.me/neardev/52121
• https://t.me/neardev/39904

Describe the solution you'd like

It would be great to have a page for alternative contract development options:

• Raw Wasm crafting (only useful for deep low-level understanding) - https://gist.github.com/vgrichina/48c7cf061032a3508a3e180e823f1637
• Tiny Rust SDK - nesdie, example
• Rust low-level example - https://github.com/fastnear/small-proxy-contract
• Zig low-level example - https://gist.github.com/vgrichina/10ea303ab1bbf3d4069cd30d28f6340e

We may also mention Aurora here in the context of, alternatively to Wasm, one could target EVM and write contracts in Solidity