Support local tls certificate file as input for tls_certificate data source

[dttung2905]

Hi team,

I would like to propose a new feature to support local tls file as an input for tls_certificate data source.

Example:

For local file

data "tls_certificate" "test" {
   input  =  file("testdata/tls_certs/public.pem")
   type   = "local"

For remote file (sitting behind and HTTPS endpoint)

data "tls_certificate" "test" {
 input = "https://your-target-website.com"
 type  = "remote"

This will serve as an extension for #62 solve #4 where the author wants to read from file ${file('path/to/cert.pem')} for example

[hashicorp-cla]

All committers have signed the CLA.

[dttung2905]

Hi @bflad,
Happy New Year to you !
It seems like you are the only active maintainers of this repo. Could you help review this MR too?

[dttung2905]

Hi @kmoe and @detro , I see that you both are the only active contributors for this project. May I have your feedback for this MR ?

[github-actions]

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