Make hash methods type strict

[cgewecke]

Part of #172 Breaking API changes

• Makes keccak, sha256 and ripemd160 buffer-only and adds fromString and fromArray variants for those inputs.

• Adds assertIsBuffer check to input of hashPersonalMessage (excluding the possibility that someone could submit an array).

Notes:

There are more methods in signature.ts which could have their params validated but overall that file seems to have clearly specified input types.

In adding convenience methods, I omitted number because idk if that's really used. However, this has been a valid input to the hash methods.

[github-actions]

Coverage increased (+0.03%) to 99.704% when pulling 0b7b413 on enforce-buffer-hash-sig into 3141eda on master.

[github-actions]

Coverage increased (+0.03%) to 99.704% when pulling 0b7b413 on enforce-buffer-hash-sig into 3141eda on master.

[github-actions]

Coverage increased (+0.03%) to 99.704% when pulling 0b7b413 on enforce-buffer-hash-sig into 3141eda on master.

[lgtm-com]

This pull request introduces 1 alert when merging 0b7b413 into 3141eda - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[holgerd77]

One case to discuss/adopt, otherwise looks good, thanks.

Mis-clicked. 😄

[holgerd77]

One case to discuss/adopt, otherwise looks good, thanks!

[lgtm-com]

This pull request introduces 1 alert when merging c7d016d into 3141eda - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[lgtm-com]

This pull request introduces 1 alert when merging dbda438 into 3141eda - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class

[holgerd77]

Looks good to me know, will merge.