wgsl: Bitwise tests

[dj2]

Complement

• [x] ~ for i32, u32 and vec of each
• [x] ~ for AbstractInt, and vectors of AbstractInt

Or, And, XOR

(|, & and ^ already have tests in shader/execution/expression/binary/bitwise.spec.ts) For each of those, validate mixed types fails to parse

Left Shift expressions

• [x] 1 << 2
• [x] Modulo for i32/u32 shift e.g. 1i << 33 shifts == 2
• [ ] most significant bits must be same for abstract (1<<63 is error, 2 <<62, etc)
• [ ] 1 << -1 is validation error
• [x] 1i << -1 is validation error
• [x] 1u << -1 is validation error
• [x] Component wise shift with vec
• [x] vec sizes don't match for shift is error

Right shift expressions

• [x] 0x80000000{i|u} >> 32 == 0x8000000 (shift is modulo)
• [x] 0x80000000{i|u} >> 31 == 1
• [x] 0x80000000 >> 32 == 0 (abstract)
• [x] 1{i32, u32} >> -1 is validation error
• [ ] 1{Abstract} >> -1 is validation error
• [x] vec sizes don't match is validation error
• [x] vec shifts component wise.