Refactor: Use list initialization {} consistently instead of assignment operator =

[coderabbitai]

Description

This issue tracks a refactoring request to consistently use list initialization {} instead of the assignment operator = for variable declarations throughout the codebase to prevent narrowing conversions and improve consistency.

Background

List initialization (uniform initialization) introduced in C++11 provides several benefits:

• Prevents narrowing conversions
• More consistent syntax across different initialization contexts
• Clearer intent in variable declarations

Current State

Currently, the codebase uses a mix of assignment operator = and list initialization {} for variable declarations.

Example of current code:

auto const timestamp = get_timestamp(log_event);

Should be refactored to:

auto const timestamp{get_timestamp(log_event)};

Scope

This refactoring should be applied consistently across all C++ files in the codebase where variable declarations currently use the assignment operator and can benefit from list initialization.

References

• Original discussion: feat: Add support for parsing UTC offset in seconds per log event and returning it in decode results (resolves #79). #99 (comment)
• Related PR: feat: Add support for parsing UTC offset in seconds per log event and returning it in decode results (resolves #79). #99

Requested by: @junhaoliao