Add static helper for pull policy

[cristianrgreco]

BREAKING CHANGES

1. DefaultPullPolicy and AlwaysPullPolicy replaced by static helper PullPolicy

Previously:

import { GenericContainer, DefaultPullPolicy, AlwaysPullPolicy } from "testcontainers";

const container1 = await GenericContainer
  .fromDockerfile("/path/to/build-context")
  .withPullPolicy(new AlwaysPullPolicy())
  .build();

const container2 = await GenericContainer
  .fromDockerfile("/path/to/build-context")
  .withPullPolicy(new DefaultPullPolicy())
  .build();

After:

import { GenericContainer, PullPolicy } from "testcontainers";

const container1 = await GenericContainer
  .fromDockerfile("/path/to/build-context")
  .withPullPolicy(PullPolicy.alwaysPull())
  .build();

const container2 = await GenericContainer
  .fromDockerfile("/path/to/build-context")
  .withPullPolicy(PullPolicy.defaultPolicy())
  .build();

---

2. PullPolicy renamed to ImagePullPolicy

Previously:

import { GenericContainer, PullPolicy } from "testcontainers";

class CustomPullPolicy implements PullPolicy {
  public shouldPull(): boolean {
    return true;
  }
}

After:

import { GenericContainer, ImagePullPolicy } from "testcontainers";

class CustomPullPolicy implements ImagePullPolicy {
  public shouldPull(): boolean {
    return true;
  }
}

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