Activate enableExternalSecretStores option

[ZhengjunHUO]

Signed-off-by: ZhengjunHUO [email protected]

Description of your changes

Fixes #100

I have:

• Read and followed Crossplane's contribution process.
• Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

Cherry picked from PR #101 for release-0.3

[ytsarev]

That looks great, thanks a lot @ZhengjunHUO

Is it possible to extend the documentation(README) with the brief documentation of ExternalSecretStore support?

[ZhengjunHUO]

@ytsarev sure thing, you're right, it could be helpful for those who are interested.

[ytsarev]

This looks great, thanks a lot @ZhengjunHUO!

[jeanduplessis]

@ZhengjunHUO I hope you’re doing well! My name is Jean and I’m an Engineering Manager at Upbound. As Upbound, we’re preparing to add crossplane-contrib/provider-terraform to our Official Provider program, which will make it part of the providers Upbound officially supports and maintains. The goal of this program is to help converge the Crossplane community’s efforts around a single set of high-quality providers. This will reduce confusion around what provider to use and accelerate project adoption. It will continue to be open source under the Apache 2.0 license, similar to the current provider but will live under the Upbound organization in GitHub and requires contributors to sign a CLA for contributions. You have some commits in crossplane-contrib/provider-terraform, including this PR, which we appreciate and would like to include in the upbound/provider-terraform official provider, too, so I’d like to ask you to sign the CLA here so we can include your contribution in the official provider. We’d also love for you to continue to contribute to the provider in its new home in the upbound org on GitHub to help us to continue supporting the community. Let me know if you have any further questions.

[ZhengjunHUO]

@jeanduplessis it's done, it's always a pleasure to contribute to the community.

[jeanduplessis]

Thank you @ZhengjunHUO 🙏🏻