Add TextChunkingProcessor event and info stats

[q-andy]

Description

Example PR to showcase adding a stats for TextChunkingProcessor

Event stats:

• Total processor execution count
• Delimiter algorithm execution count
• Fixed length algorithm execution count

Info stats:

• Number of processors in pipelines
• Number of processors by algorithm in pipelines
• Number of fixed length algorithm processors by tokenizer (standard, lowercase, whitespace, letter) in pipelines

Example response:

{
	"_nodes": {
		"total": 1,
		"successful": 1,
		"failed": 0
	},
	"cluster_name": "integTest",
	"all_nodes": {
		"ingest_processor": {
			"text_chunking": {
				"executions": 0,
				"algorithm": {
					"fixed_length": 0,
					"delimiter": 0
				}
			}
		}
	},
	"cluster_version": "3.0.0",
	"pipelines": {
		"ingest": {
			"processors": {
				"text_chunking": {
					"count": 0,
					"tokenizer": {
						"standard": 0,
						"lowercase": 0,
						"letter": 0,
						"whitespace": 0
					},
					"algorithm": {
						"fixed_length": 0,
						"delimiter": 0
					}
				}
			}
		}
	}
}

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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