Add option to set property prefix on Parameter Store property sources

[beccagaspard]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

Added the ability to specify a property prefix for parameter store property sources. This replicates the functionality recently added for secrets manager property sources (see #621, #622, #630). I pulled heavily from the secrets manager prefix implementation written by @snigdhasjg and @maciejwalkowiak to try to keep the code and documentation consistent 🤓

💡 Motivation and Context

When multiple parameter store paths are imported that contain the same key, properties will be overwritten.

For example:

• /config/my-db/url = jdbc:mysql://localhost:3306
• /config/my-db/username = mysql-user
• /config/another-db/url = jdbc:postgresql://localhost:5432/postgres

spring.config.import=aws-parameterstore:/config/my-db/;/config/another-db/ results in the following properties:

• url = jdbc:postgresql://localhost:5432/postgres
• username = mysql-user

Additionally users might want to add a prefix to their parameters for improved readability or to match autoconfig conventions. With the above properties, you can now do

spring.config.import=aws-parameterstore:/config/my-db/?prefix=spring.datasource. resulting in properties:

• spring.datasource.url = jdbc:mysql://localhost:3306
• spring.datasource.username = mysql-user

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• I updated reference documentation to reflect the change
• All tests passing
• No breaking changes

🔮 Next steps

[maciejwalkowiak]

Thank you @beccagaspard! Fantastic contribution!

[maciejwalkowiak]

@MatejNedic would you like to take a look before I merge?

[snigdhasjg]

@maciejwalkowiak @beccagaspard shall we also add this to 2.4.x branch? what do you suggest?

[maciejwalkowiak]

We don't evolve 2.x anymore, unless there is something critical

[MatejNedic]

LGTM