LSP: initiate progress reporting using the window/workDoneProgress/create request

[LDAP]

According to the LSP Specification#initiatingWorkDoneProgress the server must initiate progress reporting using the window/workDoneProgress/create request. The token provided in the create request should then only be used once.

Currently, jdtls sends $/progress notifications with kind begin without initiating progress reporting first:

:: <-  jdtls $/progress: {'token': '0ed628a5-8838-45bd-896e-65c0deda3dc7', 'value': {'kind': 'begin', 'title': 'Refreshing Maven model', 'message': 'Refreshing Maven model'}}
:: <-  jdtls $/progress: {'token': '0ed628a5-8838-45bd-896e-65c0deda3dc7', 'value': {'kind': 'report', 'percentage': 0, 'message': 'Refreshing Maven model'}}
:: <-  jdtls $/progress: {'token': '0ed628a5-8838-45bd-896e-65c0deda3dc7', 'value': {'kind': 'report', 'percentage': 0, 'message': 'Refreshing Maven model'}}
:: <-  jdtls $/progress: {'token': '0ed628a5-8838-45bd-896e-65c0deda3dc7', 'value': {'kind': 'end', 'message': 'Updating Maven Dependencies'}}
:: <-  jdtls $/progress: {'token': '0ed628a5-8838-45bd-896e-65c0deda3dc7', 'value': {'kind': 'begin', 'title': 'project test_a0aa8f63', 'message': 'Updating Maven Dependencies'}}
:: <-  jdtls $/progress: {'token': '0ed628a5-8838-45bd-896e-65c0deda3dc7', 'value': {'kind': 'end', 'message': 'Updating Maven Dependencies'}}

See: sublimelsp/LSP-jdtls#37

[rgrunber]

This might be something for @jasonhy-wang to look into. For some context, this would be a continuation of #2258 . See https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#workDoneProgress for full details.

[hopehadfield]

I'm interested in working on this