Refactor error types to use `thiserror` and internalize `BuildError` #631

Job	Run time
YAML Tests (Unreleased OpenSearch) (1.x)	6m 22s
Test (ubuntu-latest, --features aws-auth)	2m 57s
YAML Tests (Unreleased OpenSearch) (2.0)	4m 18s
YAML Tests (Released OpenSearch) (1.1.0, true)	3m 45s
YAML Tests (Unreleased OpenSearch) (2.x)	7m 34s
Test (ubuntu-latest, --no-default-features --features rustls-tls --package opensearch --test cert)	1m 44s
YAML Tests (Released OpenSearch) (1.1.0, false)	3m 59s
YAML Tests (Unreleased OpenSearch) (main)	8m 19s
Test (windows-latest, --features aws-auth)	5m 31s
YAML Tests (Released OpenSearch) (1.2.4, true)	3m 41s
Test (windows-latest, --no-default-features --features rustls-tls --package opensearch --test cert)	2m 49s
YAML Tests (Released OpenSearch) (1.2.4, false)	3m 48s
Test (macos-latest, --features aws-auth)	6m 2s
Test (macos-latest, --no-default-features --features rustls-tls --package opensearch --test cert)	3m 47s
YAML Tests (Released OpenSearch) (1.3.4, true)	3m 44s
YAML Tests (Released OpenSearch) (1.3.4, false)	3m 33s
YAML Tests (Released OpenSearch) (2.2.0, true)	3m 45s
YAML Tests (Released OpenSearch) (2.2.0, false)	3m 39s
YAML Tests (Released OpenSearch) (2.4.0, true)	4m 11s
YAML Tests (Released OpenSearch) (2.4.0, false)	3m 43s
YAML Tests (Released OpenSearch) (2.6.0, true)	4m 4s
YAML Tests (Released OpenSearch) (2.6.0, false)	3m 44s
YAML Tests (Released OpenSearch) (2.8.0, true)	4m 0s
YAML Tests (Released OpenSearch) (2.8.0, false)	3m 54s
	1h 42m 53s

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