Add metadata fields to wtez, wctez, and mockFA2

[gkaracha]

This constitutes the static/structural part of #295. Next we need to populate the metadata at deployment with bytes generated from checker.yaml.

[github-actions[bot]]

Gas costs	49d35d7e10acf837279e748578a08162502fd16d	424485ca8e13f12c9ace1d3b88ea131609767ff5	Diff
checker%remove_liquidity	13162	13293	131
checker%sell_kit	12312	12443	131
checker%buy_kit	12313	12443	130
checker%add_liquidity	12467	12597	130
wctez%mint	9021	9149	128
checker%deactivate_burrow	23259	23386	127
checker%activate_burrow	19681	19808	127
wctez%update_operators	3339	3466	127
wctez%redeem	8550	8677	127
checker%deposit_collateral	19866	19993	127
checker%withdraw_collateral	22900	23027	127
checker%create_burrow	22164	22291	127
wctez%transfer	4797	4924	127
checker%set_burrow_delegate	18186	18312	126
wtez%deposit	7373	7497	124
wtez%withdraw	9758	9881	123
wtez%set_delegate	8293	8416	123
wtez%transfer	12610	12733	123
wtez%update_operators	4054	4177	123
mockFA2%mint	3317	3436	119
mockFA2%transfer	4657	4776	119
mockFA2%redeem	3552	3671	119
mockFA2%update_operators	3199	3318	119

Entrypoint sizes: No change. Test coverage: No change.

[github-actions[bot]]

Gas costs	49d35d7e10acf837279e748578a08162502fd16d	c5f239af8c53e391d06914b007a6f6891a5beff3	Diff
checker%activate_burrow	19681	19801	120
mockFA2%redeem	3552	3671	119
mockFA2%update_operators	3199	3318	119
mockFA2%mint	3317	3436	119
checker%withdraw_collateral	22900	23019	119
checker%deposit_collateral	19866	19985	119
checker%deactivate_burrow	23259	23378	119
checker%create_burrow	22164	22283	119
mockFA2%transfer	4657	4776	119
checker%set_burrow_delegate	18186	18304	118
wtez%withdraw	9758	9875	117
wtez%deposit	7373	7490	117
wtez%transfer	12610	12726	116
wtez%update_operators	4054	4170	116
wtez%set_delegate	8293	8409	116
checker%remove_liquidity	13162	13269	107
checker%sell_kit	12312	12419	107
checker%buy_kit	12313	12420	107
checker%add_liquidity	12467	12574	107
wctez%mint	9021	9127	106
wctez%redeem	8550	8655	105
wctez%update_operators	3339	3444	105
wctez%transfer	4797	4902	105

Entrypoint sizes: No change. Test coverage: No change.