Upgrade Anchor version + support new IDL types

[mcintyre94]

This PR updates Explorer to use the latest version of @coral-xyz/anchor. Previously we were on an older version of @project-serum/anchor which couldn't parse some Anchor IDLs using new features. This led to us not displaying the IDL unexpectedly for some programs.

The IDL now displays correctly for a program with a tuple enum: (program ID propm845StqEBV57ZSnTe8EW8duzAxo5p7h4inhibXV)

We also add i256 and u256 types, which are handled the same as all other number types.

We also have new support for type aliases: (program ID 3WiKp32izVd3GLU4ieFzFEaXfx6ZsgYUuJfVufU2G4sq)

Closes #316

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Name	Status	Preview	Updated (UTC)
explorer	✅ Ready (Inspect)	Visit Preview	Jan 22, 2024 0:20am

[0x0ece]

Any plans to support anchor 0.30?

[ngundotra]

Closed by #374