Add scan function to dynamodb lib

[gmrabian]

Summary

• Adds the ability to perform a single scan of a given database (from which we can perform additional scans from where we left off)

Fixes #24

Type of change

• [x] New feature (non-breaking change which adds functionality)

How To Test

Temporarily modify the PageHeader file as follows

import dynamoClient from "../../utils/dynamodb-lib";

export const PageHeader = async () => {
  const params = {
    TableName: "institutions",
    Limit: 10,
  };
  const result = await dynamoClient.singleScan(params);
  console.log("result", result);
  console.log("items", result.Items);
  console.log("length of items", result?.Items?.length);

• Export AWS credentials in your terminal
• Run yarn dev
• Load the webpage
• Verify that your terminal (where you ran yarn dev) outputs records from the table, no more than 10 (may be fewer if table has fewer than 10)

Checklist:

• [x] My code follows the style guidelines of this project and has no linting errors
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation, including any applicable ADRs
• [x] My changes generate no new warnings
• [x] I have added tests that fail without these changes
• [x] New and existing tests (unit, integration, accessibility) pass locally
• [x] Documentation updated
• [x] If there are security concerns they are addressed or ticketed after being discussed

[codeclimate[bot]]

Code Climate has analyzed commit c982c2a4 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (90% is the threshold).

This pull request will bring the total coverage in the repository to 45.4% (1.6% change).

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