Added tracing for both otel and logging

[djthorpe]

This pull request refactors the tracing functionality in the connection options and pool setup code. The main focus is to simplify how tracers are managed by removing pointer usage, consolidating tracer initialization, and improving how trace functions and OTEL tracers are wired up. Additionally, a new option for setting only the password is introduced.

Tracing refactor and simplification

• Changed the opt struct to hold a value of tracer instead of a pointer, and updated initialization to use a value (opts.go) [1] [2].
• Removed the NewTracer and NewOTELTracer constructor functions, and updated WithTrace and WithTracer to directly set fields on the tracer struct (tracer.go, opts.go) [1] [2].
• Improved wiring of trace functions and OTEL tracers in the pool creation logic, now checking for either and assigning poolconfig.ConnConfig.Tracer as needed (pool.go).

Option improvements

• Added a new WithPassword option to set the connection password independently from username and database (opts.go).

[Copilot]

Pull request overview

Refactors how query tracing is configured for the PostgreSQL pool, and adds an option to set the password independently.

Changes:

• Switch opt from holding a *tracer to embedding a tracer value and set tracer fields directly via options.
• Update pool creation to wire tracing when either a TraceFn or OTEL tracer is configured.
• Add WithPassword option; remove exported NewTracer/NewOTELTracer constructors.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
tracer.go	Removes exported tracer constructors, leaving tracer configuration to options/field assignment.
pool.go	Updates tracer wiring logic to handle TraceFn and OTEL tracer configuration.
opts.go	Refactors tracer storage in options, adds WithPassword, and adjusts WithTrace/WithTracer to set tracer fields.

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