🔎 Expose lookup gates

[zkzoomer]

This PR makes lookup gates available from gates.ts. The intended usage is:

• For fixed lookup tables:

  import { Gates } from 'o1js';
  ...
  let indices = [Field(0), Field(1), Field(2), Field(3), Field(4), Field(5)];
  let data = [Field(2), Field(3), Field(5), Field(7), Field(11), Field(13)];
  
  // Adding lookup table with ID = 1
  Gates.addFixedLookupTable(1, indices, data);

  // Valid lookup ✔️: at index 2 value is 5, where 1 is our table ID
  Gates.lookup(Field(1), Field(2), Field(5));

  // Invalid lookup ❌: at index 5 value is 13, not 69
  // This would raise an error—proof cannot be generated
  Gates.lookup(Field(1), Field(5), Field(69);

• For dynamic lookup tables:

  import { Gates } from 'o1js';
  ...
  let indices = [Field(0), Field(1), Field(2), Field(3), Field(4), Field(5)];
  
  // Creating a dynamic lookup table with ID = 1
  Gates.addDynamicLookupTable(1, indices);

  // Filling in a value of 10 for index 2
 Gates.lookup(Field(1), Field(2), Field(10));

  // Valid lookup ✔️: at index 2 value is 10 (as was filled in), where 1 is our table ID
  Gates.lookup(Field(1), Field(2), Field(10));

  // Invalid lookup ❌: at index 2 value is not 69, cannot be overwritten
  // This would raise an error—proof cannot be generated
  Gates.lookup(Field(1), Field(2), Field(69);

Dynamic Tables: Issue

Although exposed, dynamic tables are not fully functional, which might be due to an error in some underlying dependency. Trying to compile a circuit making use of them results in an error, the stack trace being:

Error: Pickles cannot handle point at infinity. Commitments must be representable in affine coordinates
at Class. [as compile] (o1js/dist/node/bindings/js/proxy.js:21:62)
at file:/node_modules/o1js/dist/node/lib/proof_system.js:329:30
at withThreadPool (o1js/dist/node/bindings/js/node/node-backend.js:47:24)
at async prettifyStacktracePromise (o1js/dist/node/lib/errors.js:104:16)
at async compileProgram (o1js/dist/node/lib/proof_system.js:324:53)
at async Object.compile (o1js/dist/node/lib/proof_system.js:144:52)
at async testStatic (file:/build/src/lookup-tests.js:38:33)