Add false_allow_templates as a dynamic mapping option

[bruce-hong-glean]

Description

This PR adds the dynamic: false_allow_templates option to the schema. This creates mappings for any field that matches properties or dynamic_templates, and ignores any fields that do not (as opposed to rejecting altogether).

Example from linked issue, the usage is:

1. Create the index:

{
    "properties": {
        "url": { "type": "keyword" },
    },
    "dynamic": "false_allow_templates",
    "dynamic_templates": [
        {
            "dates": {
                "match": "date_*",
                "mapping": {
                    "type": "date",
                },
            },
        }
    ]
}

2. url matches an explicit property and the fields date_timestamp and date_timezone math the dynamic template:

POST index1/_doc/1
{
  "url": "www.example.com",
  "date_timestamp": "...",
  "date_timezone": "...",
  "misc_field": "..."
}

3. Produces the mapping:

{
    "properties": {
        "url": { "type": "keyword" },
        "date_timestamp": { "type": "date" },
        "date_timezone": { "type": "date" }
    }
}

Related Issues

Resolves #18617

Check List

• Functionality includes testing.
• API changes companion pull request created
• Public documentation issue/PR created

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Known flaky test failed, listed here

> Task :server:internalClusterTest

Tests with failures:
 - org.opensearch.recovery.FullRollingRestartIT.testFullRollingRestart_withNoRecoveryPayloadAndSource {p0={"cluster.indices.replication.strategy":"SEGMENT"}}

5436 tests completed, 1 failed, 56 skipped

> Task :server:internalClusterTest FAILED
build complete, generating: /var/jenkins/workspace/gradle-check/search/build/60998.tar.bz2

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Codecov Report

❌ Patch coverage is 81.94444% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.83%. Comparing base (c1dfa6a) to head (217a993).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
...va/org/opensearch/index/mapper/DocumentParser.java	80.88%	9 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #18825      +/-   ##
============================================
+ Coverage     72.75%   72.83%   +0.07%     
- Complexity    68520    68593      +73     
============================================
  Files          5570     5570              
  Lines        314998   315051      +53     
  Branches      45697    45706       +9     
============================================
+ Hits         229185   229465     +280     
+ Misses        67260    66953     -307     
- Partials      18553    18633      +80     

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