RFR: 7903121: initial jextract tool code, tests and samples [v2]

[Athijegannathan Sundararajan]

On Mon, 21 Mar 2022 17:31:11 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fixed README.md for consistent section headers
>
> README.md line 157:
> 
>> 155: 
>> 156: 
>> 157: #### Building jextract tool
> 
> You probably want just `###` in these sections (for uniformity)

Fixed that.

> README.md line 191:
> 
>> 189: ### jextract samples
>> 190: 
>> 191: jextract samples can be found "samples" top-level directory. Building/running particular sample may require
> 
> This should probably go somewhere more toplevel - e.g. in the first intro - but I'll do another pass on the document after you push.

sounds good.

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PR: https://git.openjdk.java.net/jextract/pull/2