fix(spanner): Configure keepAlive time for gRPC TCP connections

[sakthivelmanii]

Default keep alive time is 120 seconds. If customer wants to override they can override it by passing the keepAlive configuration in the opts.

[gemini-code-assist]

Summary of Changes

Hello @sakthivelmanii, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request implements a fix to configure the keepalive time for gRPC TCP connections within the Spanner client. The primary goal is to improve the robustness and reliability of gRPC communication by ensuring that connections remain active and are not prematurely terminated due to inactivity, which can often occur with network intermediaries. This change specifically sets a client-side keepalive interval to 120 seconds.

Highlights

• gRPC Keepalive Configuration: This pull request introduces a client-side keepalive configuration for gRPC TCP connections, setting a Time parameter of 120 seconds.
• Improved Connection Reliability: By configuring keepalives, the change aims to prevent idle gRPC connections from being silently dropped by network proxies or firewalls, thereby enhancing connection stability.

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[gemini-code-assist]

Code Review

This pull request adds a gRPC keepalive parameter to TCP connections to prevent them from being dropped due to inactivity. While this is a good improvement, the keepalive duration is hardcoded. My feedback suggests making this value configurable to provide more flexibility for users of this client, who may be operating in different network environments with varying idle timeout policies.