feat: add to error log when mark is not added

## Details

When a mark fails to be added due to neovim version append an error to
the logger. This should make debugging issues slightly easier, like
with: #132

Log output will look something like:

```
2024-08-14 11:59:57 [ERROR] inline marks require neovim >= 0.10.0: {
  conceal = true,
  opts = {
    conceal = "",
    end_col = 13,
    end_row = 4,
    virt_text = { { "󰌹 Basic One", "RenderMarkdownLink" } },
    virt_text_pos = "inline"
  },
  start_col = 0,
  start_row = 4
}
2024-08-14 11:59:57 [ERROR] inline marks require neovim >= 0.10.0: {
  conceal = true,
  opts = {
    conceal = "",
    end_col = 23,
    end_row = 6,
    virt_text = { { "󰌹 With Alias", "RenderMarkdownLink" } },
    virt_text_pos = "inline"
  },
  start_col = 0,
  start_row = 6
}
```

Updated issue template to ask for log output.

Author: MeanderingProgrammer

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -45,6 +45,12 @@ body:
       description: Your configuration for this plugin.
     validations:
       required: true
+  - type: textarea
+    attributes:
+      label: Plugin error log
+      description: Error log stored in vim.fn.stdpath(state)/render-markdown.log, typically ~/.local/state/nvim/render-markdown.log, if file is missing put N/A.
+    validations:
+      required: true
   - type: checkboxes
     attributes:
       label: Confirmations

doc/render-markdown.txt

@@ -1,4 +1,4 @@
-*render-markdown.txt*          For 0.10.0          Last change: 2024 August 12
+*render-markdown.txt*          For 0.10.0          Last change: 2024 August 14
 
 ==============================================================================
 Table of Contents                          *render-markdown-table-of-contents*

lua/render-markdown/health.lua

@@ -5,7 +5,7 @@ local M = {}
 
 ---@private
 ---@type string
-M.version = '6.1.3'
+M.version = '6.1.4'
 
 function M.check()
     vim.health.start('render-markdown.nvim [version]')

lua/render-markdown/list.lua

@@ -11,17 +11,17 @@ local M = {}
 ---@param opts vim.api.keyset.set_extmark
 ---@return boolean
 function M.add_mark(marks, conceal, start_row, start_col, opts)
-    -- Inline extmarks require neovim >= 0.10.0
-    if opts.virt_text_pos == 'inline' and not util.has_10 then
-        return false
-    end
     ---@type render.md.Mark
     local mark = {
         conceal = conceal,
         start_row = start_row,
         start_col = start_col,
         opts = opts,
     }
+    if opts.virt_text_pos == 'inline' and not util.has_10 then
+        logger.error('inline marks require neovim >= 0.10.0', mark)
+        return false
+    end
     logger.debug('mark', mark)
     table.insert(marks, mark)
     return true

lua/render-markdown/logger.lua

@@ -72,7 +72,6 @@ function M.debug(name, message)
     end
 end
 
----@private
 ---@param name string
 ---@param message any
 function M.error(name, message)