feat: allow option set agent replica time

[krpeacock]

Description

Adds a new feature to set and read a specified replicaTime on the HttpAgent. This is useful in situations where the device clock may not be accurate, such as in an airgapped device, since the agent needs to agree with the replica when creating an Expiry or validating certificates.

Also improves the error handling for replica time errors, throwing a new ReplicaTimeError, containing a reference back to the agent that threw it, as well as a parsed replicaTime Date object from the error message.

This replaces the offset strategy previously used.

examples

// set replica time
const agent = HttpAgent.createSync();
agent.replicaTime = new Date('2021-01-01T00:00:00Z');

// read replica time
const agent = HttpAgent.createSync();
console.log(agent.replicaTime);

// catch time error
try {
  // should throw an error
  await actor.whoami();
} catch (err) {
  // handle the replica time error. "name" will be 'ReplicaTimeError'
  if (err.name === 'ReplicaTimeError') {
    console.log(err.agent);
    console.log(err.replicaTime);
    handleErr(err);
  }
}

Important: the error response cannot be certified. Using it directly could subject users to replay attacks

Fixes SDK-1812

How Has This Been Tested?

New e2e tests

Checklist:

• My changes follow the guidelines in CONTRIBUTING.md.
• The title of this PR complies with Conventional Commits.
• I have edited the CHANGELOG accordingly.
• I have made corresponding changes to the documentation.

[github-actions]

size-limit report 📦

Path	Size
@dfinity/agent	86.33 KB (+0.43% 🔺)
@dfinity/candid	13.58 KB (0%)
@dfinity/principal	4.97 KB (0%)
@dfinity/auth-client	60.42 KB (+0.1% 🔺)
@dfinity/assets	81.14 KB (+0.19% 🔺)
@dfinity/identity	57.65 KB (+0.16% 🔺)
@dfinity/identity-secp256k1	131.89 KB (+0.57% 🔺)