Update search query builder to support int and date range queries

[chouinar]

Summary

Fixes #164

Time to review: 10 mins

Changes proposed

Adds support to our search query builder layer to handle building queries for filtering on ints and dates between specific date ranges.

Context for reviewers

Added ints and dates in the same ticket as the queries are essentially the same, just ints vs dates. While it throws an exception if both start and end values are None, I think the API request schema should also do that so that the error is more relevant/accurate to the API, but I can add that later (likely a lot more niche edge cases to handle for requests).

Nothing too exciting with these queries, they work as expected and are just simple ranges.

Additional information

The test dataset is roughly accurate (turns out books didn't always have exact release dates until the last ~20 years).

I also have tested these queries manually with the opportunity endpoints fields, the following two queries would work (can be tested locally at http://localhost:5601/app/dev_tools#/console ):

GET opportunity-index-alias/_search
{
  "size": 5,
  "query": {
    "bool": {
      "filter": [
          {
            "range": {
              "summary.post_date": {
                "gte": "2020-01-01",
                "lte": "2025-01-01"
              }
            }
          }
        ]
    }
  }
}

GET opportunity-index-alias/_search
{
  "size": 12,
  "query": {
    "bool": {
      "filter": [
          {
            "range": {
              "summary.award_floor": {
                "gte": 1234,
                "lte": 100000
              }
            }
          }
        ]
    }
  }
}