feat: Postgres Numeric and database support

[asthamohta]

No description provided.

[snippet-bot]

Here is the summary of changes.

You are about to add 12 region tags.

• samples/pg-case-sensitivity.js:26, tag spanner_postgresql_case_sensitivity
• samples/pg-database-create.js:26, tag spanner_postgresql_create_database
• samples/pg-datatypes-casting.js:26, tag spanner_postgresql_cast_data_type
• samples/pg-dml-batch.js:26, tag spanner_postgresql_batch_dml
• samples/pg-dml-partitioned.js:26, tag spanner_postgresql_partitioned_dml
• samples/pg-dml-with-parameter.js:26, tag spanner_postgresql_dml_with_parameters
• samples/pg-functions.js:26, tag spanner_postgresql_functions
• samples/pg-interleaving.js:26, tag spanner_postgresql_interleaved_table
• samples/pg-numeric-data-type.js:26, tag spanner_postgresql_numeric_data_type
• samples/pg-ordering-nulls.js:26, tag spanner_postgresql_order_nulls
• samples/pg-query-parameter.js:26, tag spanner_postgresql_query_parameter
• samples/pg-schema-information.js:26, tag spanner_postgresql_information_schema

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Warning: This pull request is touching the following templated files:

• README.md - README.md is managed by synthtool. However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/main/.readme-partials.yaml
• samples/README.md - samples/README.md is managed by synthtool. However, a partials file can be used to update the README, e.g.: https://github.com/googleapis/nodejs-storage/blob/main/.readme-partials.yaml