feat: Implement TCP connection idle timeout (#12)

* feat: Implement TCP connection idle timeout

This commit introduces an idle timeout for TCP connections in the VectorLogger.
Connections will now automatically close after one minute of inactivity.

Changes include:
- Added `lastActivityTime`, `TimeoutDuration`, `mu`, `stopChan`, and `wg` fields to `VectorLogger`.
- Modified `New()` to initialize these fields and launch a proactive connection management goroutine.
- Updated `send()` to check for idle connections before sending, re-establish if necessary, and update `lastActivityTime`.
- The proactive goroutine (`manageConnection`) periodically checks for idle connections and closes them.
- `Close()` method now gracefully stops the `manageConnection` goroutine using a channel and `sync.WaitGroup`, and ensures thread-safe connection closing.
- Added unit tests in `logger_test.go` to verify:
    - Connection timeout and automatic reconnection.
    - Frequent logging keeps the connection alive.
    - `Close()` method correctly stops the background goroutine and closes the connection.
- The `TimeoutDuration` field is exported to allow tests to set shorter timeout values.

* docs: add changelog for version 0.8.0

- Add comprehensive release notes for v0.8.0
- Document new TCP connection idle timeout management
- List improvements in connection handling and error recovery
- Include new testing infrastructure and example application
- Note breaking changes and bug fixes from v0.7.0

* feat: 0.8.0 version

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Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

fix: change module name (#11)

Co-authored-by: Serhii Kushnir <[email protected]>

fix: re-write the code to handle persistent connections (#10)

* feat: remove deprecation part

* feat: add test app and bash script to start vector

* chore: update readme and go.mod to handle local run

* fix: revert all changes with buffers to fix the lib

* chore: improve error messages

* feat: add persist connection

* feat: add re-connect

Make TCP timeout configurable via Options, defaulting to 1 second (#9)

- Persistent TCP connection with idle timeout and TCP connection timeout support.
- Graceful shutdown and draining of log messages.

feat: add fatal log message (#8)

* feat: add fatal log message

* fix: readme and FatalError

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Co-authored-by: Serhii Kushnir <[email protected]>

Merge pull request #7 from rgeoghegan/output-to-writer

feat: Let you specify different output

Merge pull request #6 from scor2k/warn-level

feat: added warn level and did a refactoring

Merge pull request #5 from scor2k/scor2k/formatted-output

feat: formatted output

Merge pull request #4 from scor2k/AK/clean-up

fix: remove instance from the Init function

Merge pull request #3 from scor2k/scor2k/rename

fix: rename repo