cdcdb: CHANGE DATA CAPTURE DATABASE

cdcdb: example demo program the connects to a database and receive some message events(insert, update, delete, ...)

Database:

PostgreSQL 13.2 : Write-Ahead Logging (WAL)
- insert
- update
- delete
MongoDB 4.4: Change Streams
- insert
- update
- replace
- delete
MySQL 8.0: Binary Log
- insert
- update
- delete

How to run

`Postgres`

Into the executable directory
```
cd pg
```
Setup replication Postgres DB inside docker evironment:
```
make setup
```
Create some tables to listen
Start listening:
```
make dev
```

`MongoDB`

Into the executable directory
```
cd mongodb
```
Setup replication MongoDB inside docker evironment:
```
make setup
```
Start listening:
```
make dev
```
Create collection and insert, delete or update some documents.