input-pill: Add multiple pill support with pasting.
input-pill: Add multiple pill support with pasting.

This allows for pasting in comma separated lists that will validate
pills on paste, along with creating an API for inserting many pills.

This now allows in the `input_pill.pill.append` a comma separated list
that will then call the `insertManyPills` method that will break up the
input and then call `append`.

synicalsyntax/zulip,showell/zulip,rht/zulip,brainwane/zulip,brainwane/zulip,shubhamdhama/zulip,hackerkid/zulip,shubhamdhama/zulip,eeshangarg/zulip,dhcrzf/zulip,synicalsyntax/zulip,rishig/zulip,dhcrzf/zulip,andersk/zulip,shubhamdhama/zulip,synicalsyntax/zulip,punchagan/zulip,zulip/zulip,hackerkid/zulip,timabbott/zulip,rishig/zulip,tommyip/zulip,zulip/zulip,synicalsyntax/zulip,jackrzhang/zulip,punchagan/zulip,shubhamdhama/zulip,timabbott/zulip,rht/zulip,hackerkid/zulip,tommyip/zulip,dhcrzf/zulip,timabbott/zulip,synicalsyntax/zulip,timabbott/zulip,synicalsyntax/zulip,jackrzhang/zulip,tommyip/zulip,tommyip/zulip,punchagan/zulip,shubhamdhama/zulip,rishig/zulip,brainwane/zulip,hackerkid/zulip,andersk/zulip,jackrzhang/zulip,eeshangarg/zulip,showell/zulip,synicalsyntax/zulip,punchagan/zulip,kou/zulip,punchagan/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,tommyip/zulip,kou/zulip,dhcrzf/zulip,showell/zulip,andersk/zulip,punchagan/zulip,rht/zulip,jackrzhang/zulip,showell/zulip,rht/zulip,zulip/zulip,andersk/zulip,kou/zulip,andersk/zulip,shubhamdhama/zulip,tommyip/zulip,kou/zulip,shubhamdhama/zulip,brainwane/zulip,dhcrzf/zulip,brainwane/zulip,punchagan/zulip,hackerkid/zulip,timabbott/zulip,showell/zulip,showell/zulip,dhcrzf/zulip,andersk/zulip,kou/zulip,kou/zulip,zulip/zulip,brainwane/zulip,eeshangarg/zulip,eeshangarg/zulip,timabbott/zulip,rishig/zulip,jackrzhang/zulip,showell/zulip,rht/zulip,hackerkid/zulip,jackrzhang/zulip,jackrzhang/zulip,timabbott/zulip,zulip/zulip,eeshangarg/zulip,hackerkid/zulip,rishig/zulip,rht/zulip,rishig/zulip,tommyip/zulip,brainwane/zulip,eeshangarg/zulip,andersk/zulip,rht/zulip,zulip/zulip,dhcrzf/zulip,rishig/zulip