Add custom client capability registration. #1013
Merged
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Metals requires a set of experimental client capabilities to be sent to the lsp server during initialisation to enable the treeview provider. In order to decouple the implementation within lsp-treemacs from lsp-mode a new lsp--client field allows the caller to specify additional client capabilities that can be sent along with the standard lsp-mode defined set. Currently these are simply additional capabilities appended to the existing fixed caps.