[feat] Update cli.ts, add `-c` support absolute path

[zhangfisher]

The - c parameter of tsoa does not support specifying an absolute path

tsoa spec-and-routes -c  c:/work/code/mylib/tsoa.json // not work

this commit is add support specifying an absolute path.

tsoa spec-and-routes -c  c:/work/code/mylib/tsoa.json // now it is work

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Potential Problems With The Approach

Test plan

[WoH]

Are you sure these tests did not pass before making the code change? Haven't checked yet, but it seems like they may be unrelated

[zhangfisher]

I have new unrelated commits before the PR is accepted

It is automatic and can be ignored

By the way, PR review is too slow

[WoH]

I assumed these trivially spottable mistakes (unrelated commits, superfluous artifacts, incorrect types/failing CI) would be noticed during the self-review of the PR