chore(textarea): create textarea

[dharmeshpipariya-zz]

creates the md-textarea feature 546

[jelbourn]

@dharmeshpipariya it will probably be a bit before we can review this; we're all tied up preparing for Angular Connect next week.

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request) and all commit authors, but as best as we can tell these commits were authored by someone else. If that's the case, please add them to this pull request and have them confirm that they're okay with these commits being contributed to Google. If we're mistaken and you did author these commits, just reply here to confirm.

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request) and all commit authors, but as best as we can tell these commits were authored by someone else. If that's the case, please add them to this pull request and have them confirm that they're okay with these commits being contributed to Google. If we're mistaken and you did author these commits, just reply here to confirm.

[jelbourn]

@dharmeshpipariya It looks like this is mostly copy-and-paste from md-input without any refactoring to reuse common parts between them. This kind of approach has a higher cost in the long run because you're now maintaining two sets of code that do the same thing. The two components should share code, potentially even being the same component with some conditionals. I'm going to close this PR since, at a high level, it's not really the way we want to approach the implementation. If you want to try a different approach, comment on #546 with your plan and we can discuss further.

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